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Ultragenyx Pharmaceutical

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FY2024 Annual Report · Ultragenyx Pharmaceutical
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 
Form 10-K
 
☑
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 
For the fiscal year ended December 31, 2024
OR 
☐
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 
For the transition period from       to
Commission File No. 001-36276
Ultragenyx Pharmaceutical Inc. 
(Exact name of registrant as specified in its charter) 
 
Delaware
27-2546083
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer Identification No.)
 
60 Leveroni Court
Novato, California
94949
(Address of principal executive offices)
(Zip Code)
(415) 483-8800 
(Registrant’s telephone number, including area code) 
Securities registered pursuant to Section 12(b) of the Exchange Act: 
 
Title of each class
Trading Symbol(s)
Name of each exchange on which registered
Common Stock, $0.001 par value
RARE
The Nasdaq Global Select Market
 
Securities registered pursuant to Section 12(g) of the Exchange Act: None. 
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    YES  ☑    NO  ☐ 
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.    YES  ☐    NO   ☑ 
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such 
shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  ☑    NO  ☐ 
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of 
this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☑    NO  ☐ 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. 
See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.  
Large accelerated filer ☑
Accelerated filer  ☐
Non- accelerated filer  ☐
Smaller reporting company  ☐
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial 
accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting 
under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☑
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error 
to previously issued financial statements. ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s 
executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    YES  ☐    NO   ☑ 
The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Company as of June 30, 2024 was approximately $3.7 billion, based upon the 
closing price on The Nasdaq Global Select Market reported for such date. Shares of common stock held by each executive officer and director and by each person who is known to own 10% or 
more of the outstanding common stock have been excluded as such persons may be deemed affiliates of the Company. This determination of affiliate status is not necessarily a conclusive 
determination for other purposes. 
As of February 13, 2025, the Company had 92,501,126 shares of common stock issued and outstanding. 
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s definitive proxy statement relating to its 2025 Annual Meeting of Stockholders, to be held on or about May 15, 2025, are incorporated by reference into 
Part III of this Annual Report on Form 10-K where indicated. Such proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year 
to which this report relates. 
 

 
 
Table of Contents 
 
 
  
Page
 
 
PART I
 
Item 1.
 Business
4
Item 1A.
 Risk Factors
29
 Item 1B.
 Unresolved Staff Comments
67
Item 1C.
  Cybersecurity
67
 Item 2.
 Properties
67
 Item 3.
 Legal Proceedings
68
 Item 4.
 Mine Safety Disclosures
68
 
 
PART II
 
 Item 5.
 Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
69
 Item 6.
 Reserved
70
 Item 7.
 Management’s Discussion and Analysis of Financial Condition and Results of Operations
71
 Item 7A.
 Quantitative and Qualitative Disclosures About Market Risk
81
 Item 8.
 Financial Statements and Supplementary Data
82
 Item 9.
 Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
82
 Item 9A.
 Controls and Procedures
82
 Item 9B.
 Other Information
84
Item 9C.
  Disclosure Regarding Foreign Jurisdictions that Prevent Inspections 
85
 
 
PART III
 
 Item 10.
 Directors, Executive Officers and Corporate Governance
86
 Item 11.
 Executive Compensation
86
 Item 12.
 Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
86
 Item 13.
 Certain Relationships and Related Transactions, and Director Independence
86
 Item 14.
 Principal Accountant Fees and Services
86
 
 
PART IV
 
 Item 15.
 Exhibits and Financial Statement Schedules
87
 Item 16.
 Form 10-K Summary
93
 SIGNATURES
94
 

 
3
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS
This Annual Report on Form 10-K, or Annual Report, contains forward-looking statements that involve risks and uncertainties. We make such forward-
looking statements pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and other federal securities laws. All 
statements other than statements of historical fact contained in this Annual Report are forward-looking statements. In some cases, you can identify forward-
looking statements by words such as "aim", “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “intend,” “may,” “plan,” 
“potential,” “predict,” “project,” “seek,” “should,” “target,” “will,” “would,” or the negative of these words, or other comparable terminology. These 
forward-looking statements include, but are not limited to, statements about: 
•
our commercialization, marketing, and manufacturing capabilities and strategy;
•
our expectations regarding the timing of clinical study commencements and reporting results from same; 
•
the timing and likelihood of regulatory approvals for, or commercialization of, our product candidates;
•
the anticipated indications for our product candidates, if approved; 
•
the potential market opportunities for commercializing our products and product candidates; 
•
our expectations regarding the potential market size and the size of the patient populations for our products and product candidates, if 
approved for commercial use; 
•
estimates of our expenses, revenue, capital requirements, and our needs for additional financing; 
•
our ability to develop, acquire, and advance product candidates into, and successfully complete, clinical studies; 
•
the implementation of our business model and strategic plans for our business, products and product candidates and the integration and 
performance of any businesses we have acquired or may acquire;
•
the initiation, timing, progress, and results of ongoing and future preclinical and clinical studies, and our research and development programs; 
•
the scope of protection we are able to establish and maintain for intellectual property rights covering our products and product candidates; 
•
our ability to maintain and establish collaborations or strategic relationships or obtain additional funding; 
•
our ability to maintain and establish relationships with third parties, such as contract research organizations, contract manufacturing 
organizations, suppliers, and distributors;
•
our financial performance, including our expectations for profitability for 2027, and the expansion of our organization; 
•
our ability to obtain supply of our products and product candidates;
•
the scalability and commercial viability of our manufacturing methods and processes;
•
developments and projections relating to our competitors and our industry;
•
stagnating or worsening business and economic conditions and increasing geopolitical instability, including inflationary pressures, general 
economic slowdown or a recession, high interest rates, foreign exchange rate volatility, financial institution instability, and changes in 
monetary policy;
•
the impact of market conditions and volatility on unrealized gains or losses on our nonqualified deferred compensation plan investments and 
our financial results; and
•
other risks and uncertainties, including those listed under “Part I, Item 1A. Risk Factors.”
Any forward-looking statements in this Annual Report reflect our current views with respect to future events or to our future financial performance 
and involve known and unknown risks, uncertainties, and other factors that may cause our actual results, performance, or achievements to be materially 
different from any future results, performance, or achievements expressed or implied by these forward-looking statements. Factors that may cause actual 
results to differ materially from current expectations include, among other things, those discussed under Part I, Item 1A. Risk Factors and elsewhere in this 
Annual Report. Given these uncertainties, you should not place undue reliance on these forward-looking statements. Except as required by law, we assume 
no obligation to update or revise these forward-looking statements for any reason, even if new information becomes available in the future.

 
4
This Annual Report also contains estimates, projections, and other information concerning our industry, our business, and the markets for certain 
diseases, including data regarding the estimated size of those markets, and the incidence and prevalence of certain medical conditions. Information that is 
based on estimates, forecasts, projections, market research, or similar methodologies is inherently subject to uncertainties and actual events or 
circumstances may differ materially from events and circumstances reflected in this information. Unless otherwise expressly stated, we obtained such 
industry, business, market, and other data from reports, research surveys, studies, and similar data prepared by market research firms and other third 
parties, industry, medical and general publications, government data, and similar sources.
As used in this Annual Report, “Ultragenyx,” “we,” “our,” and similar terms refer to Ultragenyx Pharmaceutical Inc. and its subsidiaries, unless the 
context indicates otherwise.
 
PART I 
 
Item 1. Business
Overview 
We are a biopharmaceutical company committed to bringing novel products to patients for the treatment of serious rare and ultrarare genetic 
diseases. We have built a diverse portfolio of approved therapies and product candidates aimed at addressing diseases with high unmet medical need and 
clear biology for treatment, for which there are typically no approved therapies treating the underlying disease. 
We were founded in April 2010 by our President and Chief Executive Officer, Emil Kakkis, M.D., Ph.D., and are led by a management team experienced 
in the development and commercialization of rare disease therapeutics. Our strategy is predicated upon time- and cost-efficient drug development, with the 
goal of delivering safe and effective therapies to patients with the utmost urgency. 
Our Strategy 
The critical components of our business strategy include the following: 
•
Focus on rare and ultrarare genetic diseases with significant unmet medical need and clear biology. There are numerous rare and ultrarare 
genetic diseases that currently have no drug therapy approved that treat the underlying disease. Patients suffering from these diseases often have 
a significant morbidity and/or mortality. We focus on developing and commercializing therapies for multiple such indications with the utmost 
urgency. We also focus on diseases that have biology that is well understood. We believe that developing drugs that directly impact known disease 
pathways will increase the probability of success of our development programs. Our modalities of biologics, small molecules, adeno-associated 
virus, or AAV, gene therapy, and nucleic acids provide us with what we believe is an optimal set of options to treat genetic diseases by selecting 
the best treatment strategy available for each disease.
•
In-license promising product candidates; retain global commercialization rights to product candidates. Our current product candidates are 
generally in-licensed from academic institutions or derived from partnerships with other pharmaceutical companies. We believe parties agree to 
license product candidates to us because they are confident in our team’s expertise in rare disease drug development and commercialization. We 
generally intend to retain global commercialization rights to our products and product candidates whenever possible to maximize the potential 
value of our product portfolio. 
•
Focus on excellent, rapid, and efficient clinical and regulatory execution on multiple programs in parallel. We believe that building a successful 
and sustainable rare disease-focused company requires very specific expertise in the areas of patient identification, clinical study design and 
conduct, and regulatory strategy. Because rare disease programs involve fewer patients and may have accelerated paths to market, we are able to 
feasibly develop multiple clinical-stage product candidates in parallel, resulting in a more diversified portfolio that provides multiple opportunities 
to create value, with some economies of scale.
•
Commercialize through patient-focused global organization. We seek to commercialize our products throughout the developed world, in North 
America, the European Union, or the EU, the United Kingdom, or the U.K., Latin America, Turkey, Asia, and select international markets. We have 
established our own commercial organization in these markets and a network of third-party distributors in smaller markets. We believe our 
commercial organization is highly specialized and focused, due to the nature of rare disease treatment.

 
5
Approved Products and Clinical Product Candidates
Our current approved therapies and clinical-stage pipeline consist of four product categories: biologics, small molecules, AAV gene therapy, and 
nucleic acid product candidates.
We have four commercially approved products, Crysvita® (burosumab) for the treatment of X-linked hypophosphatemia, or XLH, and tumor-induced 
osteomalacia, or TIO, Mepsevii® (vestronidase alfa) for the treatment of mucopolysaccharidosis VII, or MPSVII or Sly Syndrome, Dojolvi® (triheptanoin) for 
the treatment of long-chain fatty acid oxidation disorders, or LC-FAOD, and Evkeeza® (evinacumab) for the treatment of homozygous familial 
hypercholesterolemia, or HoFH. The following table summarizes our approved products and pipeline of clinical product candidates:

 
6
Approved Products
Crysvita for the treatment of X-Linked Hypophosphatemia, or XLH, and Tumor-Induced Osteomalacia, or TIO
Crysvita is a fully human monoclonal antibody administered via subcutaneous injection, that targets fibroblast growth factor 23, or FGF23, developed 
for the treatment of XLH. XLH is a rare, hereditary, progressive, and lifelong musculoskeletal disorder characterized by renal phosphate wasting caused by 
excess FGF23 production. There are approximately 48,000 patients with XLH in the developed world, including approximately 36,000 adults and 12,000 
children. Crysvita is the only approved treatment that addresses the underlying cause of XLH. Crysvita is approved in the U.S., the EU and certain other 
regions for the treatment of XLH in adult and pediatric patients one year of age and older.
Crysvita is also approved in the U.S. and certain other regions for the treatment of FGF23-related hypophosphatemia in TIO, associated with 
phosphaturic mesenchymal tumors that cannot be curatively resected or localized in adults and pediatric patients 2 years of age and older. There are 
approximately 2,000 to 4,000 patients with TIO in the developed world. TIO can lead to severe hypophosphatemia, osteomalacia, fractures, fatigue, bone and 
muscle pain, and muscle weakness.
We are collaborating with Kyowa Kirin Co., Ltd., or KKC, and Kyowa Kirin, a wholly owned subsidiary of KKC, on the development and 
commercialization of Crysvita globally.
Please see “—License and Collaboration Agreements—Approved Products— Kyowa Kirin Co., Ltd.” for a description of our collaboration and license 
agreement with KKC.
Mepsevii for the treatment of Mucopolysaccharidosis VII, or MPS VII
Mepsevii is an enzyme replacement therapy administered intravenously, or IV, that replaces the missing enzyme (beta-glucuronidase), developed for 
the treatment of MPS VII or Sly syndrome. MPS VII is a rare lysosomal storage disease that often leads to multi-organ dysfunction, pervasive skeletal disease, 
and death. MPS VII is one of the rarest MPS disorders, affecting an estimated 200 patients in the developed world. Mepsevii is approved in the U.S., the EU 
and certain other regions for the treatment of children and adults with MPS VII.
Please see “—License and Collaboration Agreements—Approved Products—Saint Louis University” for a description of our license agreement with 
Saint Louis University.
Dojolvi for the treatment of Long-chain Fatty Acid Oxidation Disorders, or LC-FAOD 
Dojolvi is a highly purified, synthetic, 7-carbon fatty acid triglyceride administered orally, designed to provide medium-chain, odd-carbon fatty acids as 
an energy source and metabolite replacement, developed for people with LC-FAOD. LC-FAOD represents a set of rare metabolic diseases that prevents the 
conversion of fat into energy and can cause low blood sugar, muscle rupture, and heart and liver disease. Dojolvi is approved in the U.S. and certain other 
regions as a source of calories and fatty acids for the treatment of pediatric and adult patients with molecularly confirmed LC-FAOD. There are approximately 
8,000 to 14,000 patients in the developed world with LC-FAOD.
In November 2024, we announced that we had received a positive finalized assessment report with agreement to file for Conditional Early Approval, 
or CEA, from Japan’s Pharmaceuticals and Medical Devices Agency, or PMDA, based on the currently available global clinical data for the product. With this 
feedback, we expect to file a Japan-New Drug Application for CEA in mid-2025.
Please see “—License and Collaboration Agreements—Approved Products—Baylor Research Institute” for a description of our license agreement with 
Baylor Research Institute.
Evkeeza for the treatment of Homozygous Familial Hypercholesterolemia, or HoFH 
Evkeeza is a fully human monoclonal antibody administered by IV, that binds to and blocks the function of angiopoietin-like 3, or ANGPTL3, a protein 
that plays a key role in lipid metabolism, developed for the treatment of HoFH, a rare inherited condition. HoFH occurs when two copies of the genes causing 
familial hypercholesterolemia are inherited, one from each parent, resulting in dangerously high levels (>400 mg/dL) of low-density lipoprotein-cholesterol, 
or LDL-C, which is bad cholesterol. Patients with HoFH are at risk for premature atherosclerotic disease and cardiac events as early as their teenage years. 
Evkeeza is approved in the U.S., where it is marketed by our partner Regeneron Pharmaceuticals, or Regeneron. It is also approved in the European Economic 
Area, or EEA, Brazil and Japan as a first-in-class therapy for use together with diet and other LDL-C lowering therapies. In these regions, Evkeeza is generally 
approved to treat adults and adolescents aged five years and older with clinical HoFH. There are approximately 3,000 to 5,000 patients with HoFH in the 
developed world outside of the U.S.
Please see “—License and Collaboration Agreements—Approved Products—Regeneron” for a description of our license agreement with Regeneron.

 
7
Clinical Product Candidates
UX143 (setrusumab) for the treatment of Osteogenesis Imperfecta, or OI
UX143 (setrusumab) is a fully human monoclonal antibody administered by IV that inhibits sclerostin, a protein that acts on a key bone-signaling 
pathway by inhibiting the activity of bone-forming cells and promoting bone resorption. Setrusumab is being developed for the treatment of OI, or brittle 
bone disease, which is caused by variants in the COL1A1 or COL1A2 genes, leading to either reduced or abnormal collagen and changes in bone metabolism. 
There are an estimated 60,000 patients in the developed world affected by OI. UX143 has received orphan drug designation from the U.S. Food and Drug 
Administration, or FDA, and European Medicines Agency, or EMA, Rare Pediatric Disease designation and Breakthrough Designation from the FDA, and was 
accepted into the EMA’s Priority Medicines, or PRIME, program. Setrusumab is subject to our collaboration agreement with Mereo and is the lead clinical 
asset in our bone endocrinology franchise. 
In April 2024, we announced all patients in the Phase 3 Orbit and Cosmic studies had been enrolled. The Phase 3 portion of Orbit enrolled 159 patients 
and is a randomized placebo-controlled study evaluating the effect of setrusumab compared to placebo on the rate of annualized clinical fractures in patients 
aged five to less than 25 years. Cosmic enrolled 69 patients and is an active-controlled study evaluating the effect of setrusumab compared to intravenous 
bisphosphonate, or IV-BP, therapy on annualized total fracture rate in patients aged two to less than seven years.
In June 2024, we announced positive 14-month results from the Phase 2 portion of the ongoing Phase 2/3 Orbit study demonstrating that, as of a May 
24, 2024 data cut-off date, treatment with setrusumab continued to show statistically significant reductions in the incidence of fractures in patients with OI 
compared to the pre-treatment period. Treatment with setrusumab also resulted in ongoing and meaningful improvements in lumbar spine bone mineral 
density, or BMD, at month 12 without evidence of plateau.
As we announced in June 2024, the median annualized rate of radiologically confirmed fractures across all 24 patients in the two years prior to 
treatment was 0.72. Following a mean treatment duration period of 16 months, the median annualized fracture rate was reduced 67% to 0.00 (p=0.0014; 
n=24). The reduction in annualized fracture rates was associated with continued, clinically meaningful increases in BMD. Tests conducted at the 12-month 
timepoint demonstrated that treatment with setrusumab resulted in a mean increase in lumbar spine BMD from baseline of 22% (p<0.0001, n=19) across all 
age groups (five to less than 26 years old), a further improvement from 14% observed at six months of treatment. This increase in BMD is reflected in the 
change from the mean baseline lumbar spine BMD Z-score of -1.73 to -0.49 at 12 months across all age groups, a substantial normalization in Z-score of +1.25 
(p<0.0001, n=18). This is further improved from the mean six-month Z-score change of +0.85. The improvements in BMD and Z-scores were statistically 
significant and consistent across all OI sub-types studied.
As of the May 24, 2024 data cut-off, there were no treatment-related serious adverse events observed in the study. Reported adverse events were 
generally consistent with those observed in the Asteroid study with infusion-related events and headache determined to be the most common adverse 
events related to the study drug. As of the data cut-off, there were no reported hypersensitivity reactions related to setrusumab.
In January 2025, we announced that the Phase 3 Orbit study is progressing to the second interim analysis expected in mid-2025. Patients in the 
Cosmic study also continue to be treated with either setrusumab or IV-BP therapy and will be evaluated in parallel with the second Orbit interim analysis in 
mid-2025 and final analyses, if needed, in the fourth quarter of 2025.
Please see “—License and Collaboration Agreements—Clinical Product Candidates—Mereo” for a description of our license and collaboration 
agreement with Mereo.
GTX-102 for the treatment of Angelman Syndrome
GTX-102 is an antisense oligonucleotide, or ASO, administered by intrathecal injection that inhibits expression of the paternal UBE3A antisense. GTX-
102 is being developed for the treatment of Angelman syndrome, a debilitating and rare neurogenetic disorder caused by loss-of-function of the maternally 
inherited allele of the UBE3A gene. There are an estimated 60,000 patients in the developed world affected by Angelman syndrome. GTX-102 has received 
Fast Track Designation, Orphan Drug Designation and Rare Pediatric Disease Designation from the FDA and has been accepted into the EMA’s PRIME 
program.
In January 2024, we announced that enrollment in the Expansion Cohorts had been completed in the Phase 1/2 study of GTX-102 for the treatment of 
Angelman syndrome. Across the Phase 1/2, including the Dose Escalation and Expansion Cohorts, there are a total of 74 patients enrolled in the Phase 1/2 
study. 
In April 2024, we presented interim data from the Phase 1/2 study at the 76th Annual American Academy of Neurology Meeting. Patients in 
Expansion Cohorts A & B treated with GTX-102 showed rapid and clinically meaningful improvement across multiple domains consistent with or exceeding 
Dose Escalation Cohorts 4-7 data at Day 170. Treatment of the Dose Escalation Cohorts 4-7 showed long-term increasing and sustained clinical benefit far 
exceeding Natural History data at Day 758.

 
8
In December 2024, we announced that enrollment began in the global Phase 3 Aspire study, which is expected to enroll approximately 120 children 
ages four to 17 with Angelman syndrome with a genetically confirmed diagnosis of full maternal UBE3A gene deletion. Participants will be randomized 1:1 to 
receive GTX-102 by intrathecal injection via lumbar puncture or to the sham comparator group during the 48-week primary efficacy analysis period. The 
primary endpoint will be improvement in cognition assessed by Bayley-4 cognitive raw score, and the key secondary endpoint (with a 10% allocation of 
alpha) will be the Multi-domain Responder Index across the five domains of cognition, receptive communication, behavior, gross motor function, and sleep. 
Enrollment in the Phase 3 Aspire study is expected to complete in the second half of 2025. 
The Phase 2/3 Aurora study, which will evaluate GTX-102 in other Angelman syndrome genotypes and ages, is expected to initiate in 2025.
Please see “—License and Collaboration Agreements—Clinical Product Candidates—GeneTx” for a description of our license agreement with GeneTx 
Biotherapeutics LLC, or GeneTx. 
UX111 (rebisufligene etisparvovec) for the treatment of Sanfilippo syndrome type A or MPS IIIA
UX111 (formerly ABO-102) is an adeno-associated virus 9, or AAV9, gene therapy product candidate, administered by a one-time IV infusion that 
provides the cross-correcting enzyme that enables the breakdown of Heparan sulfate, or HS. UX111 is being developed for the treatment of patients with 
Sanfilippo syndrome type A, or MPS IIIA, a rare lysosomal storage disease with no approved treatment, which primarily affects the central nervous system. 
There are an estimated 3,000 to 5,000 patients in the developed world affected by Sanfilippo syndrome type A. The program was acquired through an 
exclusive license agreement with Abeona Therapeutics, or Abeona, that was announced in May 2022. The UX111 program has received Regenerative 
Medicine Advanced Therapy, or RMAT, Fast Track, Rare Pediatric Disease, and Orphan Drug Designations in the U.S., and PRIME and Orphan Medicinal 
Product designations in the EU.
In December 2024, we submitted a BLA to the FDA for UX111 supported by the available data, including from the ongoing pivotal Transpher A study. 
New clinical data were presented at WORLDSymposium™ 2025 in February 2025, that demonstrated treatment with UX111 led to a statistically significant 
improvement in the Bayley-III raw scores for the subdomains of cognition, receptive communication and expressive communication in patients with MPS IIIA 
compared to Natural History Data from untreated patients. These clinical endpoints were correlated with substantial and sustained reduction in levels of 
heparan sulfate in cerebrospinal fluid.
The FDA granted the BLA Priority Review with a Prescription Drug User Fee Act, or PDUFA, action date of August 18, 2025.
Please see “—License and Collaboration Agreements—Clinical Product Candidates—Abeona” for a description of our license agreement with Abeona.
DTX401 (pariglasgene brecaparvovec) for the treatment of Glycogen Storage Disease Type Ia, or GSDIa
DTX401 is an adeno-associated virus 8, or AAV8, gene therapy clinical candidate, administered by a one-time IV infusion that is designed to deliver 
stable expression and activity of G6Pase-α, an essential enzyme in glycogen and glucose metabolism. DTX401 is being developed for the treatment of 
patients with GSDIa, and is the most common genetically inherited glycogen storage disease, with an estimated 6,000 patients in the developed world. A 
Pediatric Investigation Plan, or PIP, was accepted by the EMA. The DTX401 program has received Rare Pediatric Disease, RMAT, Fast Track, and Orphan Drug 
designations in the U.S., and PRIME and Orphan Medicinal Product Designations in the EU.
In May 2024, we announced positive topline results from our Phase 3 GlucoGene study for the treatment of patients aged eight years and older. The 
study achieved its primary endpoint, demonstrating that treatment with DTX401 resulted in a statistically significant and clinically meaningful reduction in 
daily cornstarch intake compared with placebo at Week 48. 
In November 2024, we provided updated, longer-term Phase 3 data. After the 48-week primary efficacy analysis period, crossover patients (previously 
treated with placebo) were eligible to receive DTX401. As of the data cut-off, 12 crossover patients had reached Week 30 post-treatment and had a 
substantial 61.6% mean reduction of daily cornstarch at this early timepoint, double the rate of decrease when compared to patients in the original DTX401 
treatment arm (n=20) at week 30 and that showed a mean 41.3% reduction at the end of the 48-weeks. Patients from the original DTX401 treatment arm 
who had reached 78 weeks are continuing to reduce their daily cornstarch intake, while maintaining glycemic control. DTX401 has demonstrated a consistent 
and acceptable safety profile with no new safety concerns identified as of the data cut-off. 
These results have been discussed with regulatory authorities in a pre-BLA meeting and will be included as part of a BLA submission in mid-2025.
Please see “—License and Collaboration Agreements—Clinical Product Candidates—REGENXBIO Inc.” for a description of our license agreement with 
REGENXBIO Inc.

 
9
DTX301 (avalotcagene ontaparvovec) for the treatment of Ornithine Transcarbamylase, or OTC, deficiency	
DTX301 is an AAV8 gene therapy product candidate, administered by a one-time IV infusion that is designed to deliver stable expression and activity 
of the OTC, gene. DTX301 is being developed for the treatment of patients with OTC deficiency, which is the most common urea cycle disorder, and there are 
approximately 10,000 patients in the developed world with OTC deficiency, of which we estimate approximately 80% are classified as late-onset, our target 
population. DTX301 has received Orphan Drug Designation in both the U.S. and in the EU and Fast Track Designation in the U.S.
In February 2025, we announced enrollment had been completed in the Phase 3 study of DTX301 for the treatment of OTC deficiency with a total of 
37 patients randomized 1:1 to DTX301 or placebo. The co-primary endpoints are the percentage of patients who achieve a response as measured by the 
change in 24-hour plasma ammonia levels and discontinuation or reduction ammonia-scavenger medications and protein-restricted diet. Based on an 
amended protocol, the change in 24-hour ammonia levels will be measured through Week 36, after which the study would unblind and patients will be 
followed for a total of up to 64 weeks to determine the complete responders able to move safely to both ammonia-scavenger medications and protein-
restricted diet control. 
Please see “—License and Collaboration Agreements—Clinical Product Candidates—REGENXBIO Inc.” for a description of our license agreement with 
REGENXBIO Inc.
UX701 (rivunatpagene miziparvovec) for the treatment of Wilson Disease
UX701 is an AAV type 9 gene therapy, administered by a one-time IV infusion that is designed to deliver a truncated form of the ATP7B gene. UX701 is 
being developed for the treatment of patients with Wilson disease, which affects more than 50,000 patients in the developed world. UX701 has received 
Orphan Drug Designation in the U.S. and in the EU. UX701 has received a Fast Track Designation from the FDA.
In February 2024, we announced that we enrolled and dosed 15 patients in the three dose escalating cohorts of the first, dose-finding, stage of the 
pivotal Cyprus2+ study of UX701 for the treatment of Wilson disease. During Stage 1, the safety and efficacy of UX701 is being evaluated across three, 
sequential dosing cohorts (Cohort 1: 5.0 x 10^12 GC/kg Cohort 2: 1.0 x 10^13 GC/kg and Cohort 3: 2.0 x 10^13 GC/kg).
In October 2024, we shared that UX701 demonstrated clinical activity in the pivotal Cyprus2+study as well as improvements in copper metabolism for 
patients treated in Stage 1. Multiple responders had completely tapered off standard-of-care treatment with responses seen in all three dose cohorts. In 
Stage 1, 15 patients were enrolled into the three sequential dosing cohorts and followed for at least 24 weeks. Six of the patients completely tapered off of 
standard-of-care treatment with chelators and/or zinc therapy, and a seventh patient had begun tapering as of the data cut-off date in August 2024. In 
patients who had tapered off standard-of-care, non-ceruloplasmin bound copper (NCC) had stabilized to normal, healthy levels. In some patients, there were 
increases in ceruloplasmin-copper activity consistent with improved ATP7b function. UX701 has been well tolerated, with no unexpected related treatment-
emergent adverse events and no significant immunologic safety events as of the data cut-off.
We expect to enroll a fourth cohort in Stage 1 at a moderately increased dose and with an optimized immunomodulation regimen to enhance the 
efficiency and efficacy of the gene therapy, with the objective of having the majority of patients come off standard-of-care treatment before selecting a dose 
for the randomized placebo-controlled stage of the study. Enrollment in Cohort 4 is expected to begin in the first half of 2025 and expected to complete in 
the second half of 2025.
Please see “—License and Collaboration Agreements—Clinical Product Candidates— REGENXBIO Inc.” for a description of our license and 
collaboration agreement with REGENXBIO Inc.
Competition
In the case of indications that we are targeting, it is possible that other companies may produce, develop, and commercialize compounds that might 
treat these diseases.
With respect to Crysvita, although we are not aware of any other products currently in clinical development by a competitor for the treatment of XLH 
and TIO, it is possible that competitors may produce, develop, and commercialize therapeutics, or utilize other approaches such as gene therapy, to treat XLH 
and TIO. Most pediatric patients with XLH are managed using oral phosphate replacement and/or vitamin D therapy, which is relatively inexpensive and 
therefore may adversely affect our ability to commercialize Crysvita, if approved, in some countries. 

 
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With respect to Mepsevii, we are not aware of any other compounds currently in clinical development for MPS VII, but it is possible that other 
companies may produce, develop, and commercialize compounds that might treat this disease. Additionally, gene therapy and other therapeutic approaches 
may emerge for the treatment of lysosomal diseases. Bone marrow or stem cell transplants have also been used in MPS VII and in other lysosomal storage 
diseases and represent a potential competing therapy. Stem cell transplants have been effective in treating soft tissue storage and in having an impact on 
brain disease, but have not to date proven effective in treating bone and connective tissue disease. Typically, enzyme replacement therapy has had an impact 
on bone and connective tissue disease in other disorders when patients were treated early. 
With respect to Dojolvi, LC-FAOD is commonly treated with diet therapy and MCT oil. Dojolvi may compete with this approach. Although we believe 
that Dojolvi should be considered a drug and will be regulated that way, it is possible that other companies or individuals may attempt to produce 
triheptanoin for use in LC-FAOD. Investigators are testing triheptanoin in clinical studies across multiple indications, including LC-FAOD. Although we are not 
aware of any other products currently in clinical development for the treatment of LC-FAOD, it is also possible that other companies may produce, develop, 
and commercialize other medium odd-chain fatty acids, or completely different compounds, to treat LC-FAOD. Other companies may also utilize other 
approaches, such as gene therapy, to treat LC-FAOD. Competitors could also enter the market with generic versions of Dojolvi. As described in “Item 3. Legal 
Proceedings” below, in 2024, Navinta LLC (Navinta), Aurobindo Pharma Limited, Aurobindo Pharma USA, Inc., or collectively, Aurobindo, Esjay Pharma 
Private Limited and Esjay Pharma LLC, or collectively, Esjay, filed ANDAs seeking FDA approval to market a generic version of Dojolvi.
With respect to Evkeeza, the current treatments for patients with HoFH involve various lipid-lowering agents to reduce serum LDL and total 
cholesterol levels. Drug therapies include statins (e.g., Rosuvastatin, Simvastatin, etc.), fenofibrate, ezetimibe (Ezetrol), evolocumab (Repatha), and 
lomitapide (Juxtapid/Lojuxta). Other than lomitapide, these agents rely on an LDL-receptor based mechanism to reduce cholesterol, which may be absent in 
HoFH patients, particularly those with LDLR-null mutations. In addition, we are aware of other clinical development programs that target ANGPTL 3 across 
various indications including HoFH, including from Arrowhead Pharmaceuticals, zodasiran an siRNA, Eli Lilly/Dicerna, solbinsiran an siRNA, Novo Nordisk, 
NNC0491-6075 an antibody, and CRISPR Therapeutics, CTX-301 a gene editor.
With respect to UX143, there are currently no approved drugs for OI. Most pediatric patients with OI are managed with off-label use of 
bisphosphonates to increase bone density and reduce frequency of bone fracture. We are aware of another anti-sclerostin antibody, romosozumab, that is in 
Phase 3 clinical testing by Amgen.
With respect to GTX-102, there are currently no approved drugs for Angelman syndrome. Many patients take general treatments to try to manage 
specific symptoms, such as seizures or sleep disturbances, but there are no treatments available that address the underlying biology of the disease. We are 
aware of other preclinical and clinical development programs for Angelman syndrome, including Phase 2 programs from Ionis, ION582 an ASO, and Neuren 
Pharmaceuticals, NNZ-2591 an IGF-1 analog.
With respect to UX111, there are currently no approved pharmacologic treatments for patients with MPS IIIA. Patients receive supportive or 
symptomatic treatment, but these approaches generally do not prevent functional decline. We are aware of other gene therapies, including EGT-101, in 
Phase 1/2 for MPSIIIA by Esteve. In addition, Orchard Therapeutics is developing OTL-201, an ex-vivo gene therapy in Phase 1/2 for MPSIIIA. We are also 
aware of enzyme replacement therapies, including DNL126, in Phase 1/2 by Denali, and JR-441, in Phase 1/2 by JCR Pharma.
With respect to DTX401, there are currently no pharmacologic treatments for patients with GSDIa. We are aware of an mRNA therapy, mRNA-3745, in 
Phase 1 for GSDIa by Moderna.
With respect to DTX301, the current treatments for patients with OTC deficiency are nitrogen scavenging drugs and severe limitations in dietary 
protein. Drug therapy includes sodium phenylbutyrate (Buphenyl) and glycerol phenylbutyrate (Ravicti), both nitrogen scavengers that help eliminate excess 
nitrogen, in the form of ammonia, by facilitating its excretion. A novel formulation of sodium phenylbutyrate, ACER-001 by Acer Therapeutics, was approved 
in December 2022. During a metabolic crisis, patients routinely receive carbohydrate and lipid rich nutrition, including overnight feeding through a 
nasogastric tube, to limit bodily protein breakdown and ammonia production. In acute cases, ammonia must be removed by dialysis or hemofiltration. Liver 
transplant may also be a solution for OTC deficiency. In addition, we are aware of other clinical development programs for OTC deficiency including from 
Arcturus Therapeutics, ARCT-810 a mRNA, Bloomsbury, BGT-OTCD a gene therapy, and iECURE, ECUR-506 a gene editor.
With respect to UX701, there are no currently approved treatments that address the underlying cause of Wilson disease. Many patients are on 
chelator therapies, but these fail to address the mutated ATP7B copper transporter gene. We are aware of a chelator, ALXN-1840, that is in Phase 3 for 
Wilson disease by Monopar Therapeutics.

 
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License and Collaboration Agreements 
Our products and some of our current product candidates have been either in-licensed from academic institutions or derived from partnerships with 
other pharmaceutical companies. Following is a description of our significant license and collaboration agreements.
Approved Products
Kyowa Kirin Co., Ltd.
In August 2013, we entered into a collaboration and license agreement with KKC. Under the terms of this collaboration and license agreement, as 
amended, we and KKC collaborate on the development and commercialization of Crysvita in the field of orphan diseases in the U.S. and Canada, or the Profit-
Share Territory, and in the EU, U.K., and Switzerland, or the European Territory, and we have the right to develop and commercialize such products in the 
field of orphan diseases in Mexico and Central and South America, or Latin America. In the field of orphan diseases, and except for ongoing studies being 
conducted by KKC, we were the lead party for development activities in the Profit-Share Territory and in the European Territory until the applicable transition 
date. We shared the costs for development activities in the Profit-Share Territory and the European Territory conducted pursuant to the development plan 
before the applicable transition date equally with KKC. In April 2023, which was the transition date for the Profit-Share Territory, KKC became the lead party 
and became responsible for the costs of the development activities. However, we will continue to share the costs of the studies commenced prior to the 
applicable transition date equally with KKC. Crysvita was approved in the EU and U.K. in February 2018 and was approved by the FDA in April 2018. As 
described below, we and KKC shared commercial responsibilities and profits in the Profit-Share Territory until April 2023, KKC has the commercial 
responsibility in the European Territory, and we are responsible for commercializing Crysvita in Latin America and Turkey. 
In the Profit-Share Territory, KKC booked sales of products and we had the sole right to promote the products, with KKC having the right to 
increasingly participate in the promotion of the products until the transition date of April 2023, which was five years from commercial launch. The parties 
subsequently agreed that we would have the right to continue to support KKC in commercial field activities in the U.S. through January 31, 2025, as 
amended. After January 31, 2025, our rights to promote Crysvita in the U.S. are limited to medical geneticists and we solely bear our expenses for the 
promotion of Crysvita in the Profit-Share Territory. See “Item I.A. Risk Factors” for additional information on the risks related to our dependency on KKC for 
the commercialization of Crysvita in the Profit-Share Territory. In the European Territory, KKC books sales of products and has the sole right to promote and 
sell the products, with the exception of Turkey. In Turkey, we have rights to commercialize Crysvita and KKC has the option to assume responsibility for such 
commercialization efforts. In Latin America, we book sales of products and have the sole right to promote and sell the products.
Under the collaboration agreement, KKC manufactures and supplies Crysvita for sales in Latin American territories and we pay KKC a transfer price of 
30% of net sales. We also pay KKC a low single-digit royalty on net sales in Latin America. The remaining profit or loss from commercializing products in the 
Profit-Share Territory was shared between us and KKC on a 50/50 basis until April 2023. In April 2023, commercialization responsibilities for Crysvita in the 
Profit-Share Territory transitioned to KKC and KKC assumed responsibility for the commercialization of Crysvita in the Profit-Share Territory at and after April 
2023. Thereafter, we are entitled to receive a tiered double-digit revenue share from the mid-20% range up to a maximum rate of 30%, intended to 
approximate the profit-share. Our and KKC’s obligations to pay royalties will continue on a country-by-country basis for so long as we or KKC, as applicable, 
are selling products in such country. 
In July 2022, we sold to OCM LS23 Holdings LP, an investment vehicle for the Ontario Municipal Employees Retirement System, or OMERS, our right to 
receive 30% of the future royalty payments due to us based on net sales of Crysvita in the U.S. and Canada, subject to a cap, beginning in April 2023. KKC 
pays us a royalty of up to 10% based on net sales in the European Territory. We sold our interest in the European Territory royalty to RPI Finance Trust, an 
affiliate of Royalty Pharma, in December 2019.
The collaboration and license agreement will continue for as long as products in the field of orphan diseases are sold in the Profit-Share Territory, 
European Territory, Turkey, or Latin America, unless the agreement is terminated in accordance with its terms. 
KKC may terminate the agreement in certain countries or territories based upon our failure to meet certain milestones. Furthermore, either party may 
terminate the agreement for the material breach or bankruptcy of the other party. In any event of termination by KKC, unless such termination is the result 
of KKC’s termination for certain types of breach of the agreement by us, we may receive low single-digit to low double-digit royalties on net post-termination 
sales by KKC in one or more countries or territories, the amount of which varies depending on the timing of, and reason for, such termination. In any event of 
termination, our rights to Crysvita under the agreement and our obligations to share development costs will cease, and the program will revert to KKC, 
worldwide if the agreement is terminated as a whole or solely in the terminated countries if the agreement is terminated solely with respect to certain 
countries. 

 
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Saint Louis University 
In November 2010, we entered into a license agreement with Saint Louis University, or SLU, wherein SLU granted us certain exclusive rights to 
intellectual property related to Mepsevii. Under the terms of the license agreement, SLU granted us an exclusive worldwide license to make, have made, use, 
import, offer for sale, and sell therapeutics related to SLU’s beta-glucuronidase product for use in the treatment of human diseases. 
Under the license agreement, we are obligated to pay to SLU a low single-digit royalty on net sales of the licensed products in Europe and Japan, 
subject to certain potential deductions. Our obligation to pay royalties to SLU in these territories continues until the expiration of any orphan drug exclusivity.
Baylor Research Institute 
In September 2012, we entered into a license agreement, which was subsequently amended, with Baylor Research Institute, or BRI, under which we 
exclusively licensed certain intellectual property related to Dojolvi. The license includes patents, patent applications, know-how, and intellectual property 
related to the composition and formulation of Dojolvi as well as its use in treating a number of orphan diseases, including LC-FAOD. The license grant 
includes the sole right to develop, manufacture, and commercialize licensed products for all human and animal uses. Under the license agreement, we are 
obligated to use commercially reasonable efforts to develop and commercialize licensed products in select orphan indications. If we fail to meet our diligence 
obligations with respect to a specified orphan indication or set of orphan indications, BRI may convert our license to a non-exclusive license with respect to 
such orphan indication or set of orphan indications until we receive regulatory approval for licensed products in the applicable orphan indication or set of 
orphan indications. 
We are also obligated to pay a mid- single-digit royalty on net sales to BRI, subject to certain reductions and offsets. Our obligation to pay royalties to 
BRI continues on a licensed product-by-licensed product and country-by-country basis until the later of the expiration of the first regulatory exclusivity 
granted with respect to such product in such country or the expiration of the last-to-expire licensed patent claiming such product in such country, in each 
case in connection with approval in such country for LC-FAOD or an orphan disease covered by our license from BRI.
Regeneron
In January 2022, we announced a collaboration with Regeneron to commercialize Evkeeza for HoFH outside of the U.S. Pursuant to the terms of the 
agreement, we received the rights to develop, commercialize and distribute the product for HoFH in countries outside of the U.S. The Company paid 
Regeneron a $30.0 million upfront payment. To date, we have recognized an aggregate of $27.5 million for regulatory and sales milestones and have in 
aggregate up to $35.5 million of future obligations for additional regulatory and sales milestones, if achieved. We may share in certain costs for global trials 
led by Regeneron and also received the right to opt into other potential indications.
Under the collaboration agreement, Regeneron supplies the product and charges us a transfer price from the low 20% range up to 40% of net sales.
Clinical Product Candidates
REGENXBIO Inc.
In October 2013, we entered into an exclusive license agreement with REGENXBIO Inc., or REGENX, under which we were granted an option to 
develop products to treat OTC deficiency and GSDIa. Under the 2013 license agreement, REGENX granted us an exclusive worldwide license to make, have 
made, use, import, sell, and offer for sale licensed products with respect to such disease indications, subject to certain exclusions. We do not have the right 
to control prosecution of the in-licensed patent applications, and our rights to enforce the in-licensed patents are subject to certain limitations. Under the 
2013 license agreement, we pay or will pay REGENX an annual maintenance fee and certain milestone fees per disease indication, low to mid- single-digit 
royalty percentages on net sales of licensed products, and milestone and sublicense fees, if any, owed by REGENX to its licensors as a result of our activities 
under the 2013 license agreement. We are required to develop licensed products in accordance with certain milestones. In the event that we fail to meet a 
particular milestone within established deadlines, we can extend the relevant deadline by providing a separate payment to REGENX.

 
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In March 2015, we entered into an option and license agreement with REGENX, which was subsequently amended, pursuant to which we have an 
exclusive worldwide license to make, have made, use, import, sell, and offer for sale licensed products to treat Wilson disease and CDKL5 deficiency. We do 
not have the right to control prosecution of the in-licensed patent applications, and our rights to enforce the in-licensed patents are subject to certain 
limitations. Under the 2015 option and license agreement, as amended, we pay or will pay REGENX an annual maintenance fee and certain milestone fees 
per disease indication, mid- to high single-digit royalty percentages on net sales of licensed products, and mid- single to low double-digit percentages of any 
sublicense fees we receive from sublicenses for the licensed intellectual property rights. We are required to develop licensed products in accordance with 
certain milestones. In the event that we fail to meet a particular milestone within established deadlines, we can extend the relevant deadline by providing a 
separate payment to REGENX.
In March 2020, we entered into a license agreement with REGENX, for an exclusive, sublicensable, worldwide license to REGENX’s NAV AAV8 and 
AAV9 vectors for the development and commercialization of gene therapy treatments for a rare metabolic disorder. In return for these rights, we made an 
upfront payment and pay or will pay certain annual fees, milestone payments and royalties on any net sales of products incorporating the licensed 
intellectual property that range from a high single-digit to low double-digit.
University of Pennsylvania
In May 2016, we entered into a research, collaboration and license agreement with the University of Pennsylvania, or UPENN, under which we are 
collaborating on the pre-clinical development of gene therapy products for the treatment of phenylketonuria and Wilson disease, each, a Subfield. Under the 
agreement, we were granted an exclusive, worldwide, royalty-bearing right and license to certain patent rights arising out of the research program, and a 
non-exclusive, worldwide, royalty-bearing right and license to certain University of Pennsylvania intellectual property, in each case to research, develop, 
make, have made, use, sell, offer for sale, commercialize and import licensed products in each Subfield for the term of the agreement. We will fund the cost 
of the research program and will be responsible for clinical development, manufacturing and commercialization of each Subfield. In addition, we are required 
to make milestone payments (up to a maximum of $5.0 million per Subfield) if certain development milestones are achieved over time. We will also make 
milestone payments of up to $25.0 million per approved product, if certain commercial milestones are achieved, and will pay low to mid- single-digit 
royalties on net sales of each Subfield’s licensed products.
GeneTx
In August 2019, we entered into a Program Agreement and a Unitholder Option Agreement with GeneTx to collaborate on the development of 
GeneTx’s GTX-102, an ASO for the treatment of Angelman syndrome. In July 2022, pursuant to the terms of the Unitholder Option Agreement, as amended, 
we exercised the Option to acquire GeneTx and entered into a Unit Purchase Agreement, or the Purchase Agreement, pursuant to which we purchased all 
the outstanding units of GeneTx. In accordance with the terms of the Purchase Agreement, we paid the option exercise price of $75.0 million, an additional 
$15.6 million to acquire the outstanding cash of GeneTx, and adjustments for working capital and transaction expenses of $0.6 million, for a total purchase 
consideration of $91.2 million. During the year ended December 31, 2024, we achieved a $30.0 million regulatory milestone upon the initiation of the Phase 
3 Aspire clinical study for GTX-102. In addition, we are obligated to pay up to $85.0 million in additional regulatory approval milestones for the achievement 
of U.S. and EU product approvals, and up to $75.0 million in commercial milestone payments based on annual worldwide net product sales, contingent upon 
the achievement of the milestones. We will also pay tiered mid- to high single-digit percentage royalties based on licensed product annual net sales. If we 
receive and resell an FDA priority review voucher, or PRV, in connection with a new drug application approval, GeneTx unitholders are entitled to receive a 
portion of proceeds from the sale of the PRV or a cash payment from us, if we choose to retain the PRV. 
As part of our acquisition of GeneTx, we assumed a License Agreement with Texas A&M University, or TAMU. To date, we have recognized an 
aggregate of $0.5 million for clinical milestones under the TAMU agreement, and have in aggregate up to $23.0 million of future obligations for various 
future milestones, if achieved, a nominal annual license fee that may increase up to a maximum of $2.0 million, as well as royalties in the mid-single-digits of 
net sales.

 
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Mereo
In December 2020, we entered into a License and Collaboration Agreement with Mereo to collaborate on the development of setrusumab. Under the 
terms of the agreement, we will lead future global development of setrusumab in both pediatric and adult patients with OI and were granted an exclusive 
license to develop and commercialize setrusumab in the U.S., Turkey, and the rest of the world, excluding the EEA, UK, and Switzerland, or the Mereo 
Territory, where Mereo retains commercial rights. Each party will be responsible for post-marketing commitments and commercial supply in their respective 
territories.
Upon the closing of the transactions under the License and Collaboration Agreement with Mereo in January 2021, we made a payment of $50.0 
million to Mereo. To date we have recognized an aggregate $9.0 million for regulatory milestones and have in aggregate up to $245.0 million of future 
obligations for additional regulatory and sales milestones under the agreement, if achieved. We will pay for all global development costs as well as tiered 
double-digit percentage royalties to Mereo on net sales in the U.S., Turkey, and the rest of the world, and Mereo will pay us a fixed double-digit percentage 
royalty on net sales in the Mereo Territory. If we receive and resell an FDA PRV in connection with a new drug application approval, Mereo is entitled to 
receive a portion of proceeds from the sale of the PRV or a cash payment from us, in the event we choose to retain the PRV. 
In December 2024, we entered into a manufacturing and supply agreement with Mereo where we are responsible for the supply of setrusumab to 
Mereo in the Mereo territory. Mereo is responsible to reimburse us for a portion of the manufacturing process development costs as well as future 
commercial supply costs.
Abeona 
In May 2022, we announced an exclusive License Agreement with Abeona for an AAV gene therapy for the treatment of MPS IIIA, or UX111. Under 
the terms of the agreement, we assumed responsibility for the UX111 program and in return, we are obligated to pay Abeona certain UX111-related prior 
development costs and other transition costs. Abeona is eligible to receive tiered royalties of up to 10% on net sales and commercial milestone payments of 
up to $30.0 million following regulatory approval of the product. Additionally, we entered into an Assignment and Assumption Agreement with Abeona to 
transfer and assign to us the exclusive license agreement between Nationwide Children’s Hospital, or NCH, and Abeona for certain rights related to UX111. 
Under this agreement, NCH is eligible to receive from us up to $1.0 million in development and regulatory milestones as well as royalties in the low single-
digits of net sales. 
Preclinical Pipeline 
Solid Biosciences Inc.
In October 2020, we entered into a strategic Collaboration and License Agreement with Solid Biosciences Inc., or Solid, and received an exclusive 
license for any pharmaceutical product that expresses Solid’s proprietary microdystrophin construct from AAV8 and variants thereof in clade E for use in the 
treatment of Duchenne muscular dystrophy and other diseases resulting from lack of functional dystrophin, including Becker muscular dystrophy. We are 
collaborating to develop products that combine Solid’s differentiated microdystrophin construct, our Pinnacle PCLTM producer cell line platform, or Pinnacle 
PCL Platform, manufacturing platform, and our AAV8 variants. Solid may provide some development support and was granted an exclusive option to co-
invest in products we develop for profit-share participation in certain territories. We also entered into a Stock Purchase Agreement with Solid in October 
2020 pursuant to which we purchased 521,719 shares (as adjusted for the October 2022 reverse stock split) of Solid’s common stock for an aggregate price 
of $40.0 million. 
Patents and Proprietary Rights 
The proprietary nature of, and protection for, our products, product candidates, processes, and know-how are important to our business. Our success 
depends in part on our ability to protect our products, product candidates, processes, and know-how, to operate without infringing on the proprietary rights 
of others, and to prevent others from infringing our proprietary rights. We seek patent protection in the U.S. and internationally for our products, product 
candidates, and processes. Our policy is to patent or in-license the technologies, inventions, and improvements that we consider important to the 
development of our business. In addition to patent protection, we rely on trade secrets, know-how, and continuing innovation to develop and maintain our 
competitive position.

 
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We also use other means to protect our products and product candidates, including the pursuit of marketing or data exclusivity periods, orphan drug 
status, and similar rights that are available under regulatory provisions in certain countries, including the U.S., Europe, Japan, and China. See “Government 
Regulation—U.S. Government Regulation — Orphan Designation and Exclusivity,” “Government Regulation—U.S. Government Regulation — Pediatric 
Studies and Exclusivity,” “Government Regulation—U.S. Government Regulation — Biosimilars and Exclusivity,” “Government Regulation—U.S. Government 
Regulation — Abbreviated New Drug Applications for Generic Drugs and New Chemical Entity Exclusivity,” “Government Regulation—U.S. Government 
Regulation — Patent Term Restoration,” “Government Regulation—EU Regulation — Orphan Designation and Exclusivity,” and “Government Regulation—EU 
Regulation — New Chemical Entity Exclusivity” below for additional information. 
We seek regulatory approval for our products and product candidates in disease areas with high unmet medical need, significant market potential, 
and where we expect to have a proprietary position through patents covering various aspects of our product candidates, such as composition, dosage, 
formulation, use, and manufacturing process, among others. Our success depends in part on an intellectual property portfolio that supports our future 
revenue streams and erects barriers to our competitors. We are maintaining and building our patent portfolio by filing new patent applications, prosecuting 
existing applications, and licensing and acquiring new patents and patent applications. 
Despite these measures, any of our intellectual property and proprietary rights could be challenged, invalidated, circumvented, infringed, or 
misappropriated, or such intellectual property and proprietary rights may not be sufficient to achieve or maintain market exclusivity or otherwise to provide 
competitive advantages. We also cannot be certain that patents will be granted with respect to any of our pending patent applications or with respect to any 
patent applications filed by us in the future, nor can we be sure that any of our existing patents or any patents granted to us in the future will be 
commercially useful in protecting our products, product candidates, or processes. For more information, please see “Item I.A. Risk Factors Risks Related to 
Our Intellectual Property.”
As of December 31, 2024, we own, jointly own, or have exclusive rights to more than 275 issued and in-force patents (not including individually 
validated national patents in European Patent Convention member countries) that cover one or more of our products or product candidates, methods of 
their use, or methods of their manufacture, including more than 50 in-force patents issued by the U.S. Patent and Trademark Office, or the USPTO. 
Furthermore, as of December 31, 2024, we own, jointly own, or have exclusive rights to more than 325 pending patent applications, including more than 50 
pending U.S. applications. 
With respect to our owned or in-licensed issued patents in the U.S. and Europe, we may be entitled to obtain an extension of patent term to extend 
the patent expiration date. For example, in the U.S., this extended coverage period is known as patent term extension, or PTE, and can only be obtained 
provided we apply for and receive a marketing authorization for a product. The period of extension may be up to five years beyond the expiration of the 
patent, but cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval. Only one patent among those 
eligible for an extension may be extended. In Europe, a Supplementary Protection Certificate, or SPC, may be available to extend the term of certain 
European patents covering our products; this requires application for an SPC in individual European Patent Convention, or EPC, member countries following 
product approval. However, there is no guarantee that the applicable authorities, including the FDA, will agree with our assessment of whether such 
extensions should be granted, and even if granted, the length of such extensions. In the U.S., the exact duration of the extension depends on the time we 
spend in clinical studies as well as getting marketing approval from the FDA. 
The exclusivity positions for our commercial products and our clinical-stage product candidates as of December 31, 2024, are summarized below.
Crysvita Exclusivity
We have in-licensed rights from KKC to patents and patent applications relating to Crysvita and its use for the treatment of XLH, TIO, and various other 
hypophosphatemic conditions. Pursuant to this license, we have rights to six issued U.S. patents, as well as issued patents and patent applications in other 
jurisdictions. The U.S. patents expire between 2028 and 2035. In addition to the foregoing patent protections, Crysvita is protected in the U.S. by regulatory 
exclusivity until 2030 and by orphan drug exclusivity for treating XLH and TIO until 2025 and 2027, respectively. 
Mepsevii Exclusivity
We own four issued U.S. patents and corresponding issued foreign patents covering Mepsevii and its use in the treatment of lysosomal storage 
disorders such as MPS VII. These patents expire in 2035. Mepsevii is also protected in the U.S. by regulatory exclusivity until 2029. 

 
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Dojolvi Exclusivity
We have an exclusive license from BRI to patents and patent applications relating to Dojolvi and its use for the treatment of FAOD. Pursuant to this 
license, we have rights to two issued U.S. patents covering Dojolvi which expire in 2025 and 2029. Beyond the patent portfolio in-licensed from BRI, we own 
four pending U.S. patent applications, corresponding foreign patent applications, and issued patents in Australia, Brazil, Canada, Israel, Korea, Malaysia, 
Taiwan, and Thailand relating to our pharmaceutical-grade Dojolvi composition; these owned patents and any additional patents issuing from these owned 
applications are expected to expire in 2034. Dojolvi is also protected in the U.S. by regulatory exclusivity until 2025 and orphan drug exclusivity for treating 
FAOD until 2027. 
Evkeeza Exclusivity
We have an exclusive license from Regeneron to certain Regeneron patents for the development and commercialization of Evkeeza outside of the U.S. 
for the treatment of HoFH and other hyperlipidemia and hypercholesterolemia indications. The in-licensed Regeneron patent portfolio includes a patent 
family containing several issued foreign patents that expire in 2032 and cover the Evkeeza antibody; Regeneron has filed supplementary protection 
certificates to extend the rights associated with the European patent within this family until 2036 in certain countries. The in-licensed Regeneron patent 
portfolio contains five other patent families, one of which includes several pending patent applications directed to a stabilized pharmaceutical formulation 
comprising Evkeeza; we expect any patents emanating from this patent family to expire in 2040. In addition to the foregoing patent protections, Evkeeza is 
protected in Europe by data exclusivity until 2029 and marketing exclusivity until 2031. 
DTX401 (Pariglasgene Brecaparvovec) Exclusivity
We have a non-exclusive license from the National Institutes of Health, or NIH, to an issued U.S. patent expiring in 2034 (not accounting for any 
available PTE) and corresponding foreign patents covering a recombinant nucleic acid construct used in DTX401 that includes a codon-optimized version of 
the G6Pase gene.
DTX301 (Avalotcagene Ontaparvovec) Exclusivity
We have an exclusive sub-license to a patent family that includes three issued U.S. patents expiring in 2035 (not accounting for any available PTE) and 
corresponding foreign patents and patent applications covering the codon-optimized version of the OTC gene used in DTX301; this patent family is owned by 
UPENN and sublicensed to us by REGENX.
UX143 (Setrusumab) Exclusivity
We have in-licensed rights from Mereo to patents and patent applications relating to setrusumab and its use for the treatment of OI. Pursuant to our 
license from Mereo, we have exclusive rights outside of Europe to a Mereo patent family that includes three issued U.S. patents and corresponding issued 
foreign patents that relate to the setrusumab antibody, nucleic acids encoding setrusumab, processes for producing setrusumab, and setrusumab’s use as a 
medicament. Patents emanating from this patent family expire in 2028 (not accounting for any available PTE). We also have exclusive rights outside of 
Europe to two additional Mereo patent families, including two issued U.S. patents expiring in 2037 (not accounting for any available PTE), relating to 
methods of using anti-sclerostin antibodies including setrusumab for the treatment of OI. Beyond these Mereo patents and patent applications, we jointly 
own with Mereo a patent family relating to dosing regimens for the use of anti-sclerostin antibodies including setrusumab in the treatment of OI; we expect 
any patents emanating from this patent family to expire in 2042 (not accounting for any available PTE). 
UX111 (Rebisufligene Etisparvovec) Exclusivity 
We have an exclusive license from Nationwide Children’s Hospital, or NCH, to a pending U.S. patent application covering a method of treating MPS IIIA 
by intravenously administering a recombinant AAV9 vector comprising a U1a promoter and a polynucleotide sequence encoding N-sulfoglucosamine 
sulfohydrolase, or SGSH; we expect any patent emanating from this application to expire in 2032 (not accounting for any available PTE). 
GTX-102 (Antisense Oligonucleotide) Exclusivity
We have an exclusive license from TAMU to a patent family filed in the U.S. and several foreign jurisdictions relating to UBE3A antisense 
oligonucleotides including GTX-102 and their use for the treatment of Angelman syndrome. The in-licensed TAMU patent family includes four issued U.S. 
patents expiring in 2038 (not accounting for any available PTE). Beyond the patent estate licensed from TAMU, we own a pending patent family relating to 
dosing regimens for the use of UBE3A antisense oligonucleotides including 

 
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GTX-102 in the treatment of Angelman syndrome; we expect any patents emanating from this patent family to expire in 2045 (not accounting for any 
available PTE).
UX701 (Rivunatpagene Miziparvovec) Exclusivity 
We have two licenses to patents and patent applications covering elements of our UX701 product candidate. First, we have a license to a U.S. patent 
expiring in January 2026 which relates to the AAV9 capsid used in UX701; this patent is owned by UPENN and sublicensed to us by REGENX. Second, we have 
an exclusive license from UPENN to a patent family filed in the U.S. and several foreign jurisdictions relating to AAV vectors containing certain regulatory and 
coding sequences packaged in UX701; this patent family includes an issued U.S. patent expiring in 2039 (not accounting for any available PTE). Beyond these 
in-licenses, we own a patent family covering AAV vectors expressing a novel truncated version of the ATP7B protein produced by UX701; we expect any 
patents emanating from this patent family to expire in 2040 (not accounting for any available PTE). 
Trademarks 
We own registered trademarks covering the Ultragenyx word mark in the U.S. and multiple other jurisdictions. In addition, we have a pending 
trademark application in the U.S. covering a stylized design of our Ultragenyx logo. We also own registered trademarks in the U.S. and other territories 
relating to our Mepsevii and Dojolvi brand names for vestronidase alfa and triheptanoin, respectively. We additionally have licenses from KKC and Regeneron 
to registered trademarks covering the Crysvita and Evkeeza brand names, respectively, in territories where we have rights to commercialize these products.
Other 
We rely upon unpatented trade secrets, know-how, and continuing technological innovation to develop and maintain our competitive position. We 
seek to protect our ownership of know-how and trade secrets through an active program of legal mechanisms including assignments, confidentiality 
agreements, material transfer agreements, research collaborations, and licenses.
Manufacturing 
While we currently contract with third parties for the manufacturing and testing of most of our products and product candidates for use in preclinical, 
clinical, and commercial applications, 2024 was the first full year of Good Manufacturing Practices, or GMP, operation for our Gene Therapy Manufacturing 
Facility in Bedford, Massachusetts. This facility is focused on drug substance and drug product manufacturing of AAV gene therapy products and will support 
our clinical and commercial pipeline. This new capability combines with our existing gene therapy process and analytical development and QC lab capabilities 
in nearby Woburn, Massachusetts to form a fully integrated gene therapy development, manufacturing, and testing unit.
The use of contracted manufacturing and reliance on collaboration partners has historically minimized our direct investment in manufacturing 
facilities and additional staff early in development. Although we rely on contract manufacturers, we have personnel with extensive manufacturing experience 
to oversee our contract manufacturers. All of our third-party manufacturers are subject to periodic audits to confirm compliance with applicable regulations 
and must pass inspection before we can manufacture our drugs for commercial sales.
For the other non-gene therapy modalities, we primarily use third-party manufacturers to meet our projected needs for commercial manufacturing. 
Third parties with whom we currently work might need to increase their scale of production, or we will need to secure alternate suppliers. We believe that 
there are alternate sources of supply that can satisfy our clinical and commercial requirements, although we cannot be certain that identifying and 
establishing relationships with such sources, if necessary, would not result in significant delay or material additional costs.
Products
Mepsevii 
The Mepsevii drug substance is manufactured by Rentschler Biopharma SE, or Rentschler, under non-exclusive commercial supply and services 
agreements. The cell line to produce Mepsevii is specific for this product and is in our control and stored in multiple secure locations. All other raw materials 
are commercially available.
Crysvita 
The drug substance and drug product for burosumab are made by KKC in Japan under the collaboration and license agreement and supply agreements 
with KKC. The cell line to produce burosumab is specific for this product and is in KKC’s control. All other raw materials are commercially available. 

 
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Dojolvi 
The pharmaceutical-grade drug substance for Dojolvi is manufactured by IOI Oleo GmbH, or IOI Oleo, in Germany under an exclusive worldwide 
supply agreement.
In March 2023, the Dojolvi drug product manufacturer Aenova Haupt Pharma Wolfratshausen GmbH notified us of their intent to close the facility by 
the end of 2023. In response to this information, we produced additional DP batches prior to the facility closure at the end of 2023 and have identified a new 
DP manufacturer. We have completed the process performance validation activities and plan to submit the regulatory change in early 2025. Our current DP 
inventories are expected to support demand through at least the end of 2025.
Evkeeza 
On January 7, 2022, we announced a license and collaboration agreement with Regeneron for us to clinically develop, commercialize and distribute 
Evkeeza in countries outside of the U.S. Evkeeza is a fully human monoclonal antibody that binds to and blocks the function of angiopoietin-like 3, or 
ANGPTL3, a protein that plays a key role in lipid metabolism.
The Evkeeza drug substance is manufactured by Regeneron at their manufacturing facility in Rensselaer, New York and the drug product is 
manufactured by Baxter Pharmaceutical Solutions, LLC at their manufacturing facility in Bloomington, Indiana. Release testing of the drug product is 
performed by Regeneron and third-party suppliers.
We utilize third-party suppliers to perform packaging, labelling, distribution, and testing as needed for Evkeeza.
Product Candidates
The drug substances and drug products for our product candidates are manufactured using our network of GMP contract manufacturing 
organizations, or CMOs, which are carefully selected and actively managed for high quality, reliable clinical supply. The CMOs are located in Western Europe 
or North America.
Commercialization and Product Support 
We have built our own commercial organizations in North America, Europe, Latin America and Japan to effectively support the commercialization of 
our products and product candidates, if approved. Our intention is to expand our product portfolio and its geographic accessibility through the continued 
development of our proprietary pipeline or through strategic partnerships. We may elect to utilize strategic partners, distributors, or contract management 
organizations to assist in the commercialization of our products in certain geographies. The commercial infrastructure for rare disease products typically 
consists of a targeted, specialty field organization that educates a limited and focused group of physicians supported by field management and internal 
support teams, which includes marketing, patient support services, distribution, and market access. One challenge, unique to commercializing therapies for 
rare diseases, is the difficulty in identifying eligible patients due to the very small and sometimes heterogeneous patient populations along with often 
undefined clinical or genetic tests to confirm diagnosis. Our commercial and medical affairs teams focus on maximizing patient identification for both clinical 
development and commercialization purposes in rare diseases. 
Additional capabilities important to the rare disease marketplace in the U.S. include the management of key stakeholders such as managed care 
organizations, specialty pharmacies, specialty distributors, and government payers. In many countries outside the U.S. single national payers are critical to 
providing reimbursement access. To develop the appropriate commercial infrastructure, we will have to invest a significant amount of financial and 
management resources, some of which will be committed prior to regulatory approval of the products that they are intended to support. 
We continue to support commercial and medical affairs organizations as well as other capabilities across North America, Europe, Latin America, and 
Japan to meet the educational needs of the healthcare providers and patients in the rare disease community, focusing on providing accurate disease state 
information and balanced product information across our portfolio for appropriate management of patients with rare disorders.
Medical affairs is comprised of the following capabilities in support of our mission: medical information, patient advocacy, patient diagnosis liaisons, 
medical science liaisons, research and educational grants. Medical affairs will engage as early as Phase 1 and will continue work throughout the lifecycle of 
each product and product candidate as dictated by the specific scientific needs in each therapeutic area.

 
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Government Regulation 
Government authorities in the U.S. (including federal, state, and local authorities) and in other countries, extensively regulate, among other things, 
the manufacturing, research and clinical development, marketing, labeling and packaging, storage, distribution, post-approval monitoring and reporting, 
advertising and promotion, pricing, and export and import of pharmaceutical products, such as those we are developing. We must obtain the requisite 
approvals from regulatory authorities in the U.S. and foreign countries prior to the commencement of clinical studies or marketing of the product in those 
countries. Accordingly, our operations are and will be subject to a variety of regulations and other requirements, which vary from country to country. The 
process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local, and foreign statutes and regulations require 
the expenditure of substantial time and financial resources that has a significant impact on our capital expenditures and results of operations.
Global Regulation of Clinical Studies 
Clinical studies involve the administration of an investigational medicinal product to human subjects under the supervision of qualified investigators in 
accordance with protocols, Good Clinical Practices, or GCP, the ethical principles that have their origin in the Declaration of Helsinki and applicable regulatory 
requirements. A protocol for each clinical study and any subsequent protocol amendments are typically submitted to the FDA or other applicable regulatory 
authorities as part of an investigational new drug application, or IND, or clinical trial application, or CTA. Additionally, approval must also be obtained from 
each clinical study site’s institutional review board, or IRB, or Ethics Committee, or EC, before the studies may be initiated, and the IRB or EC must monitor 
the study until completed. There are also requirements governing the reporting of ongoing clinical studies and clinical study results to public registries. 
The clinical investigation of a drug is generally divided into three or four phases. Although the phases are usually conducted sequentially, they may 
overlap or be combined. 
•
Phase 1. The drug is initially introduced into healthy human subjects or patients with the target disease or condition. These studies are designed 
to evaluate the safety, dosage tolerance, pharmacokinetics, and pharmacologic actions of the investigational new drug in humans, and if 
possible, to gain early evidence on effectiveness. 
•
Phase 2. The drug is administered to a limited patient population to evaluate dosage tolerance and optimal dosage, identify possible adverse 
side effects and safety risks, and preliminarily evaluate efficacy. 
•
Phase 3. The drug is administered to an expanded patient population, generally at geographically dispersed clinical study sites to generate 
enough data to statistically evaluate dosage, clinical effectiveness, and safety, to establish the overall benefit-risk relationship of the 
investigational new drug product, and to provide an adequate basis for product approval. 
•
Phase 4. In some cases, additional studies and patient follow-up are conducted to gain experience from the treatment of patients in the intended 
therapeutic indication. Regulatory authorities may condition approval of a marketing application for a product candidate on the sponsor’s 
agreement to conduct additional clinical studies after approval. In other cases, a sponsor may voluntarily conduct additional clinical studies after 
approval to gain more information about the drug. Such post-approval studies are typically referred to as Phase 4 clinical studies.
A pivotal study is a clinical study that adequately meets regulatory authority requirements for the evaluation of a drug candidate’s efficacy and safety 
such that it can be used to justify the approval of the product. Generally, pivotal studies are Phase 3 studies, but regulatory authorities may accept results 
from Phase 2 studies if the study design provides a well-controlled and reliable assessment of clinical benefit, particularly in situations where there is an 
unmet medical need and the results are sufficiently robust. 
U.S. Government Regulation 
In the U.S., the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and its implementing regulations, and biologics under 
the FDCA and the Public Health Service Act, or PHSA, and its implementing regulations. FDA approval is required before any new drug or dosage form, 
including a new use of a previously approved drug, can be marketed in the U.S. Drugs and biologics are also subject to other federal, state, and local statutes 
and regulations. 
The process required by the FDA before product candidates may be marketed or sold in the U.S. generally involves the following: 
•
completion of extensive preclinical laboratory tests and preclinical animal studies performed in accordance with the Good Laboratory Practices, 
or GLP, regulations and the U.S. Department of Agriculture’s Animal Welfare Act; 
•
submission to the FDA of an IND, which must become effective before human clinical studies may begin and must be updated annually; 

 
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•
conducting adequate and well-controlled human clinical studies that generally follow the three- to four-phase design described above to 
establish the safety and efficacy, or for BLA products, the safety, purity, and potency, of the product candidate for each proposed indication 
under an active IND and approved by an independent IRB representing each clinical site; 
•
preparation of and submission to the FDA of a new drug application, or NDA, or biologics license application, or BLA, after completion of all 
pivotal clinical studies; 
•
potential review of the product application by an FDA advisory committee, where appropriate and if applicable; 
•
satisfactory completion of an FDA pre-approval inspection of the manufacturing facilities where the proposed drug substance and drug product 
are produced to assess compliance with GMP;
•
FDA inspection of one or more clinical sites to assure compliance with GCP; and 
•
FDA review and approval of an NDA or BLA.
Submission of an NDA or BLA to the FDA 
Assuming successful completion of all required testing in accordance with all applicable regulatory requirements, detailed investigational new drug 
product information is submitted to the FDA in the form of an NDA or BLA requesting approval to market the product for one or more indications. Under 
federal law, the submission of most NDAs and BLAs is subject to a significant application user fee, unless waived. 
Pursuant to Title 21 of the Code of Federal Regulations, the FDA conducts a preliminary review of an NDA within 60 days of receipt. FDA procedures 
provide that the FDA will inform the sponsor by the 74th day after the FDA’s receipt of submission to determine whether the application is sufficiently 
complete to permit substantive review. The FDA may request additional information rather than accept an NDA for filing, in which case the application must 
be resubmitted with the requested additional information. The resubmitted application is also subject to review before it is accepted for filing. Once the 
submission is accepted for filing, the FDA begins an in-depth substantive review.
Once an NDA or BLA has been accepted, the FDA’s goal is to review the application within ten months after it accepts the application for filing, or, if 
the application relates to an unmet medical need in the treatment of a serious or life-threatening condition, six months after the FDA accepts the application 
for filing. The review process can be significantly extended by FDA requests for additional information or clarification. 
The FDA’s Decision on an NDA or BLA 
The FDA may issue an approval letter if it finds the application has adequate support for commercial marketing. An approval letter authorizes 
commercial marketing of the drug with specific prescribing information for specific indications. As a condition of NDA or BLA approval, the FDA may impose 
additional requirements, such as post-marketing studies and/or a Risk Evaluation and Mitigation Strategy, or REMS, to help ensure that the benefits of the 
drug outweigh the potential risks. A REMS can include medication guides, assessment plans, communication plans for healthcare professionals, and elements 
to assure safe use. The FDA may also issue a Complete Response Letter, which indicates that the review cycle of the application is complete but the 
application is not ready for approval. A Complete Response Letter may require additional clinical data and/or an additional pivotal Phase 3 clinical study(ies), 
and/or other significant, expensive and time-consuming requirements related to clinical studies, preclinical studies or manufacturing. If the conditions set 
forth in the Complete Response Letter are met, the FDA may approve the product for marketing. 
Expedited Review and Accelerated Approval Programs 
A sponsor may seek approval of its product candidate under programs designed to accelerate the FDA’s review and approval of NDAs and BLAs. For 
example, Fast Track Designation may be granted to a drug intended for treatment of a serious or life-threatening disease or condition and data demonstrate 
its potential to address unmet medical needs for the disease or condition. The key benefits of fast-track designation are the eligibility for priority review, 
rolling review (submission of portions of an application before the complete marketing application is submitted), and accelerated approval, if relevant criteria 
are met. The FDA may grant the NDA or BLA a priority review designation, which sets the target date for FDA action on the application at six months after the 
FDA accepts the application for filing. Priority review is granted where there is evidence that the proposed product would be a significant improvement in the 
safety or effectiveness of the treatment, diagnosis, or prevention of a serious condition. Priority review designation does not change the scientific/medical 
standard for approval or the quality of evidence necessary to support approval. 

 
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The FDA may approve an NDA or BLA under the accelerated approval program if the drug treats a serious condition, provides a meaningful advantage 
over available therapies, and demonstrates an effect on either (1) a surrogate endpoint that is reasonably likely to predict clinical benefit, or (2) on a clinical 
endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or 
mortality or other clinical benefit, taking into account the severity, rarity, or prevalence of the condition and the availability or lack of alternative treatments. 
Post-marketing studies or completion of ongoing studies after marketing approval are generally required to verify the drug’s clinical benefit in relationship to 
the surrogate endpoint or ultimate outcome in relationship to the clinical benefit. The FDA may require, as appropriate, that such studies be underway prior 
to approval or within a specific time period after the date of approval for a product that has been granted accelerated approval. The FDA also has authority 
for expedited procedures to withdraw approval of a product or indication that was initially approved under accelerated approval if the sponsor fails to 
conduct the required post-marketing studies or if such studies fail to verify the predicted clinical benefit. In addition, as a condition for accelerated approval, 
the FDA currently also requires pre-approval of promotional materials, which could adversely impact the timing of the commercial launch of the product.
In addition, the Food and Drug Administration Safety and Innovation Act, or FDASIA, established the Breakthrough Therapy designation. A sponsor 
may seek FDA designation of its product candidate as a breakthrough therapy if the drug is intended, alone or in combination with one or more other drugs, 
to treat a serious or life-threatening disease or condition and preliminary clinical evidence indicates that the drug may demonstrate substantial improvement 
over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. If a drug 
is designated as a breakthrough therapy, the FDA will provide more intensive guidance on the drug development program and expedite its review.
Furthermore, the FDA has made available expedited programs to sponsors of regenerative medicine therapies that have been granted designation as 
a regenerative medicine advanced therapy, or RMAT. Regenerative medicine therapies include cell therapies, therapeutic tissue engineering products and 
human cell and tissue products. A sponsor may seek RMAT designation if its regenerative medicine product is intended to treat, modify, reverse, or cure a 
serious or life-threatening condition and preliminary clinical evidence indicates that the regenerative medicine therapy has the potential to address unmet 
medical needs for such condition. Advantages of the RMAT designation include early interactions with the FDA to discuss the development plan for the 
product candidate, including potential surrogate or intermediate endpoints, and eligibility for rolling and priority review. Products granted RMAT designation 
may also be eligible for accelerated approval on the basis of a surrogate or intermediate endpoint reasonably likely to predict long-term clinical benefit, or 
reliance upon data obtained from a meaningful number of sites, including through expansion to additional sites. RMAT-designated products that receive 
accelerated approval may, as appropriate, fulfill their post-approval requirements through the submission of clinical evidence, clinical studies, patient 
registries, or other sources of real-world evidence (such as electronic health records); through the collection of larger confirmatory data sets; or via post-
approval monitoring of all patients treated with such therapy prior to approval of the therapy.
Orphan Designation and Exclusivity 
Under the Orphan Drug Act, the FDA may grant orphan drug designation to drugs intended to treat a rare disease or condition that affects fewer than 
200,000 individuals in the U.S., or if it affects more than 200,000 individuals in the U.S. and there is no reasonable expectation that the cost of developing 
and making the drug for this type of disease or condition will be recovered from sales in the U.S. Orphan drug designation must be requested before 
submitting an NDA or BLA. After the FDA grants orphan drug designation, the identity of the therapeutic agent and its potential orphan use are publicly 
disclosed by the FDA.
Orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical study costs, tax advantages, 
and user-fee waivers. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process. In 
addition, the first NDA or BLA applicant to receive orphan drug designation for a particular drug is entitled to orphan drug exclusivity, which means the FDA 
may not approve any other application to market the same drug for the same indication for a period of seven years in the U.S., except in limited 
circumstances. Orphan drug exclusivity does not prevent the FDA from approving a different drug for the same disease or condition, or the same drug for a 
different disease or condition.
There is some uncertainty with respect to the FDA’s interpretation of the scope of orphan drug exclusivity. Historically, exclusivity was specific to the 
orphan indication for which the drug was approved. As a result, the scope of exclusivity was interpreted as preventing approval of a competing product. 
However, in 2021, the federal court in Catalyst Pharmaceuticals, Inc. v. Becerra, suggested that orphan drug exclusivity covers the full scope of the orphan-
designated “disease or condition” regardless of whether a drug obtained approval for a narrower use. 

 
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Pediatric Studies and Exclusivity 
NDAs and BLAs must contain data to assess the safety and effectiveness of an investigational new drug product for the claimed indications in all 
relevant pediatric populations in order to support dosing and administration for each pediatric subpopulation for which the drug is safe and effective. The 
FDA may, on its own initiative or at the request of the applicant, grant deferrals for submission of some or all pediatric data until after approval of the 
product for use in adults or full or partial waivers if certain criteria are met. Pediatric development plans can be discussed with the FDA at any time, but 
usually occur any time between the end-of-Phase 2 meeting and submission of the NDA or BLA. Unless otherwise required by regulation, the requirements 
for pediatric data do not apply to any drug for an indication for which orphan designation has been granted. 
Pediatric exclusivity is another type of non-patent exclusivity in the U.S. that may be granted if certain FDA requirements are met, such as FDA’s 
determination that information relating to the use of a new drug in the pediatric population may produce health benefits, and the applicant agrees to 
perform and report on FDA-requested studies within a certain time frame. Pediatric exclusivity adds a period of six months of exclusivity to the end of all 
existing marketing exclusivity and patents held by the sponsor for that active moiety. This is not a patent term extension, but it effectively extends the 
regulatory period during which the FDA cannot accept or approve another application relying on the NDA or BLA sponsor’s data. 
Biosimilars and Exclusivity 
The Patient Protection and Affordable Care Act of 2010, or Affordable Care Act, includes a subtitle called the Biologics Price Competition and 
Innovation Act of 2009, or BPCI Act, which created an abbreviated approval pathway for biological products shown to be similar to, or interchangeable with, 
an FDA-licensed reference biological product. 
A reference biologic is granted twelve years of exclusivity from the time of first licensure of the reference product. The first biologic product 
submitted under the abbreviated approval pathway that is determined to be interchangeable with the reference product has exclusivity against other 
biologics submitted under the abbreviated approval pathway for the lesser of (i) one year after the first commercial marketing, (ii) eighteen months after 
approval if there is no legal challenge, (iii) eighteen months after the resolution in the applicant’s favor of a lawsuit challenging the biologics’ patents if an 
application has been submitted, or (iv) 42 months after the application has been approved if a lawsuit is ongoing within the 42-month period.
The Inflation Reduction Act of 2022, or the IRA, is intended to foster generic and biosimilar competition and to lower drug and biologic costs. The IRA 
provides the Centers for Medicare & Medicaid Services, or CMS, with significant new authorities. CMS is able to directly negotiate prescription drug prices 
and to cap out-of-pocket costs. Each year, CMS will select and negotiate a preset number of high-spend drugs and biologics covered under Medicare Parts B 
and D that lack generic or biosimilar competition. Price negotiations began in 2023. Effective from 2023, the IRA provides a new “inflation rebate” that covers 
Medicare patients and is intended to counter certain price increases in prescription drugs. The inflation rebate requires drug manufacturers to pay a rebate 
to the federal government if the price for a drug or biologic under Medicare Parts B or D increases faster than the rate of inflation. To support biosimilar 
competition, qualifying biosimilars may receive a Medicare Part B payment increase for a period of five years, beginning in October 2022. Separately, if a 
biologic drug for which no biosimilar exists delays a biosimilar’s market entry beyond two years, CMS will be authorized to subject the biologics manufacturer 
to price negotiations intended to ensure fair competition. Notwithstanding these provisions, the IRA’s impact on competition and commercialization remains 
largely uncertain. 
Abbreviated New Drug Applications for Generic Drugs and New Chemical Entity Exclusivity
The Drug Price Competition and Patent Term Restoration Act of 1984, or the Hatch-Waxman Amendments, authorized the FDA to approve generic 
drugs that are bioequivalent (i.e. identical) to previously approved branded drugs. To obtain approval of a generic drug, an applicant must submit an 
abbreviated new drug application, or ANDA, to the FDA. In support of such applications, a generic manufacturer may rely on the preclinical and clinical 
testing conducted for a drug product previously approved under an NDA, known as the reference listed drug, or RLD. 
Specifically, in order for an ANDA to be approved, the FDA must find that the generic version is bioequivalent to the RLD with respect to the active 
ingredients, the route of administration, the dosage form, quality and performance characteristics, the strength of the drug, and intended use. 
The FDCA provides a period of five years of non-patent exclusivity for a new drug containing a new chemical entity. In cases where such exclusivity has 
been granted, an ANDA may not be filed with the FDA until the expiration of five years unless the submission is accompanied by a Paragraph IV certification, 
in which case the applicant may submit its application four years following the original product approval. The FDCA also provides for a period of three years 
of exclusivity if an NDA or supplement includes reports of one or more new clinical investigations, other than bioavailability or bioequivalence studies, that 
were conducted by or for the applicant and are essential to the approval of the application. This three-year exclusivity period often protects changes to a 
previously approved drug product, such as a new dosage form, route of administration, combination or indication. 

 
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When an ANDA applicant files its application with the FDA, it must certify, among other things, that the new product will not infringe the already 
approved product’s listed patents or that such patents are invalid or unenforceable, which is called a Paragraph IV certification. If the applicant does not 
challenge the listed patents or indicates that it is not seeking approval of a patented method of use, the ANDA application will not be approved until all the 
listed patents claiming the referenced product have expired. If the ANDA applicant has provided a Paragraph IV certification to the FDA, the applicant must 
also send notice of the Paragraph IV certification to the NDA and patent holders once the ANDA has been accepted for filing by the FDA. The NDA and patent 
holders may then initiate a patent infringement lawsuit in response to the notice of the Paragraph IV certification. The filing of a patent infringement lawsuit 
within 45 days after the receipt of a Paragraph IV certification automatically prevents the FDA from approving the ANDA until the earlier of 30 months after 
the receipt of the Paragraph IV notice, expiration of the patent, or a decision in the infringement case that is favorable to the ANDA applicant.
Section 505(b)(2) New Drug Applications
As an alternative path to FDA approval for modifications to formulations or uses of products previously approved by the FDA pursuant to an NDA, an 
applicant may submit an NDA under Section 505(b)(2) of the FDCA. Section 505(b)(2) was enacted as part of the Hatch-Waxman Amendments and permits 
the filing of an NDA where at least some of the information required for approval comes from studies not conducted by, or for, the applicant, and for which 
the applicant has not obtained a right of reference. If the Section 505(b)(2) applicant can establish that reliance on the FDA’s previous findings of safety and 
effectiveness is scientifically and legally appropriate, it may eliminate the need to conduct certain preclinical studies or clinical trials of the new product. The 
FDA may also require companies to perform additional bridging studies or measurements, including clinical trials, to support the change from the previously 
approved reference drug. The FDA may then approve the new drug candidate for all, or some, of the label indications for which the reference drug has been 
approved, as well as for any new indication sought by the Section 505(b)(2) applicant.
To the extent that a Section 505(b)(2) applicant is relying on studies conducted for an already approved product, the applicant is required to certify to 
the FDA concerning any patents listed for the approved product in the Orange Book to the same extent that an ANDA applicant would. As a result, approval 
of a Section 505(b)(2) NDA can be stalled until all the listed patents claiming the referenced product have expired, until any non-patent exclusivity (such as 
exclusivity for obtaining approval of a new chemical entity) listed in the Orange Book for the referenced product has expired and, in the case of a Paragraph 
IV certification and subsequent patent infringement suit, until the earlier of 30 months, settlement of the lawsuit, or a decision in the infringement case that 
is favorable to the Section 505(b)(2) applicant. 
Patent Term Restoration
Some of our U.S. patents may be eligible for limited patent term extension under the Hatch-Waxman Amendments. The Hatch-Waxman Amendments 
permit a patent restoration term of up to five years as compensation for patent term lost during product development and the FDA regulatory review 
process. However, patent term restoration cannot extend the remaining term of a patent beyond a total of 14 years from the product’s approval date. The 
patent term restoration period is generally one-half the time between the effective date of an IND and the submission date of an NDA or BLA, plus the time 
between the submission date and the approval of that application. Only one patent applicable to an approved product is eligible for the extension and the 
application for the extension must be submitted prior to the expiration of the patent. The USPTO, in consultation with the FDA, reviews and approves the 
application for any patent term extension or restoration. Thus, for each approved product, we may apply for restoration of patent term for one of our related 
owned or licensed patents to add patent life beyond the original expiration date, depending on the expected length of the clinical studies and other factors 
involved in the filing of the relevant NDA or BLA.
EU Regulation 
In the EU and in Iceland, Norway and Liechtenstein, together the European Economic Area or EEA, after completion of all required clinical testing, 
pharmaceutical products may only be placed on the market after obtaining a Marketing Authorization, or MA. To obtain a MA, we must submit a marketing 
authorization application, or MAA. The content of the MAA is similar to that of an NDA or BLA filed in the U.S., with the exception of, among other things, 
country-specific document requirements. 

 
24
Authorization Procedures
Medicines can be authorized by using, among other things, a centralized or decentralized procedure. The centralized authorization procedure results 
in a single marketing authorization issued by the European Commission, or EC, following the scientific assessment of the application by the European 
Medicines Agency, or EMA, that is valid across the EEA. The centralized procedure is compulsory for specific medicinal products, including medicines 
developed by means of certain biotechnological processes, products designated as orphan medicinal products, advanced therapy medicinal products, or 
ATMPs, and medicinal products with a new active substance indicated for the treatment of certain diseases (for instance, AIDS, cancer, neurodegenerative 
disorders, diabetes, auto-immune and viral diseases). Medicines that fall outside the mandatory scope of the centralized procedure have three routes to 
authorization: (i) they can be authorized under the centralized procedure if they concern a significant therapeutic, scientific or technical innovation, or if their 
authorization would be in the interest of public health; (ii) they can be authorized under a decentralized procedure where an applicant applies for 
simultaneous authorization in more than one EU country; or (iii) they can be authorized in a EU member state in accordance with that state’s national 
procedures and then be authorized in other EU countries by a procedure whereby the countries concerned agree to recognize the validity of the original, 
national marketing authorization (mutual recognition procedure). 
All new MAAs must include a Risk Management Plan, or RMP, describing the risk management system that the Company will put in place and 
documenting measures to prevent or minimize the risks associated with the product. RMPs are continually modified and updated throughout the lifetime of 
the medicine as new information becomes available. We need to submit an updated RMP: (i) at the request of EMA or a national competent authority, or (ii) 
whenever the risk-management system is modified, especially as the result of new information being received that may lead to a significant change to the 
benefit-risk profile or as a result of an important pharmacovigilance or risk-minimization milestone being reached. The regulatory authorities may also 
impose specific obligations as a condition of the MA. RMPs and Periodic Safety Update Reports, or PSURs, are routinely available to third parties requesting 
access, subject to limited redactions.
Special rules apply in part for ATMPs. ATMPs comprise gene therapy products, somatic cell therapy products and tissue engineered products, which 
are genes, cells or tissues that have undergone substantial manipulation and that are administered to human beings in order to cure, diagnose or prevent 
diseases or regenerate, repair or replace a human tissue. Pursuant to the ATMP Regulation, the Committee on Advanced Therapies, or CAT, is responsible in 
conjunction with the CHMP for the evaluation of ATMPs. The CHMP and CAT are also responsible for providing guidelines on ATMPs. These guidelines 
provide additional guidance on the factors that the EMA will consider in relation to the development and evaluation of ATMPs and include, among other 
things, the preclinical studies required to characterize ATMPs. The manufacturing and control information that should be submitted in a MAA; and post-
approval measures required to monitor patients and evaluate the long- term efficacy and potential adverse reactions of ATMPs. Although such guidelines are 
not legally binding, compliance with them is often necessary to gain and maintain approval for product candidates. In addition to the mandatory RMP, the 
holder of a MA for an ATMP must put in place and maintain a system to ensure that each individual product and its starting and raw materials, including all 
substances coming into contact with the cells or tissues it may contain, can be traced through the sourcing, manufacturing, packaging, storage, transport and 
delivery to the relevant healthcare institution where the product is used.
A Pediatric Investigation Plan, or PIP, and/or a request for waiver (for example, because the relevant disease or condition occurs only in adults) or 
deferral (for example, until enough information to demonstrate its effectiveness and safety in adults is available), is required for submission prior to 
submitting an MAA. A PIP describes, among other things, proposed pediatric studies and their timing relative to clinical studies in adults and an MAA must 
comply with the PIP to be validated.
MAA Review and Approval Timeframe and Accelerated Assessment 
Under the centralized procedure in the EU, the Committee for Medicinal Products for Human Use, or CHMP, established at the EMA, is responsible for 
conducting the initial assessment of a drug. In principle, the maximum timeframe for the evaluation of an MAA by the CHMP is 210 days from receipt of a 
valid MAA. However, this timeline excludes clock stops, when additional written or oral information is to be provided by the applicant in response to 
questions asked by the CHMP, so the overall process typically takes a year or more. A favorable opinion on the application by the CHMP will typically result in 
the granting of the marketing authorization within 67 days of receipt of the opinion. Accelerated evaluation might be granted by the CHMP in exceptional 
cases, when a medicinal product is expected to be of a major public health interest, particularly from the point of view of therapeutic innovation. In this 
circumstance, and upon request by the applicant, the CHMP’s evaluation time frame is reduced to 150 days, excluding time taken by an applicant to respond 
to questions.

 
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MA Validity Period 
MAs have an initial duration of five years. After five years, the authorization may subsequently be renewed on the basis of a reevaluation of the risk-
benefit balance. Once renewed, the MA is valid for an unlimited period unless the EC or the national competent authority decides, on justified grounds 
relating to pharmacovigilance, to proceed with only one additional five-year renewal. Applications for renewal must be made to the EMA at least nine 
months before the five-year period expires.
Conduct of Clinical Trials 
Clinical trials are studies intended to discover or verify the effects of one or more investigational medicines. The regulation of clinical trials aims to 
promote the protection of the rights, safety and well-being of trial participants and the credibility of the results of clinical trials. Regardless of where they are 
conducted, all clinical trials included in applications for marketing authorization for human medicines in the EU or EEA must have been carried out in 
accordance with EU regulations (such as, among others, the Clinical Trials Regulation (Regulation (EU) No 536/2014) and the Clinical Trials Directive (EC) No 
2001/20/EC). This means that clinical trials conducted in the EU or EEA have to comply with EU clinical trial legislation and that clinical trials conducted 
outside the EU or EEA have to comply with ethical principles equivalent to those set out in the EEA, including adhering to international good clinical practice 
and the Declaration of Helsinki.
Exceptional Circumstances/Conditional Approval 
Orphan drugs or drugs with unmet medical needs may be eligible for EU approval under exceptional circumstances or with conditional approval. 
Approval under exceptional circumstances is applicable to orphan products and is used when an applicant is unable to provide comprehensive data on the 
efficacy and safety under normal conditions of use because the indication for which the product is intended is encountered so rarely that the applicant 
cannot reasonably be expected to provide comprehensive evidence, when the present state of scientific knowledge does not allow comprehensive 
information to be provided, or when it is medically unethical to collect such information. A conditional MA is applicable to orphan medicinal products, 
medicinal products for seriously debilitating or life-threatening diseases, or medicinal products to be used in emergency situations in response to recognized 
public threats. Conditional MAs can be granted for medicinal products where, although comprehensive clinical data referring to the safety and efficacy of the 
medicinal product have not been supplied, a number of criteria are fulfilled: (i) the benefit/risk balance of the product is positive, (ii) it is likely that the 
applicant will be in a position to provide the comprehensive clinical data, (iii) unmet medical needs will be fulfilled by the grant of the MA and (iv) the benefit 
to public health of the immediate availability on the market of the medicinal product concerned outweighs the risk inherent in the fact that additional data 
are still required. Conditional MAs are valid for only one year and must be reviewed annually subject to certain specific obligations.
PRIME Program
PRIME is a program launched by the EMA to enhance support for the development of medicines that target an unmet medical need. The program 
focuses on medicines that may offer a major therapeutic advantage over existing treatments, or benefit patients without treatment options. These medicines 
are considered priority medicines by EMA. To be accepted for PRIME, a medicine has to show its potential to benefit patients with unmet medical needs 
based on early clinical data. Through PRIME, the EMA offers early and proactive support to medicine developers to optimize development plans and the 
generation of robust data on a medicine’s benefits and risks and enables accelerated assessment of medicines applications. PRIME eligibility does not change 
the standards for product approval, and there is no assurance that any such designation or eligibility will result in expedited review or approval.

 
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Orphan Designation and Exclusivity
As in the U.S., we may apply for designation of a product as an orphan drug for the treatment of a specific indication in the EU before the application 
for marketing authorization is made. The EMA’s Committee for Orphan Medicinal Products, or COMP, grants orphan drug designation to promote the 
development of products that are intended for the diagnosis, prevention, or treatment of life-threatening or chronically debilitating conditions affecting not 
more than 5 in 10,000 persons in the EU Community and for which no satisfactory method of diagnosis, prevention, or treatment has been authorized (or the 
product would be a significant benefit to those affected). Additionally, designation is granted for products intended for the diagnosis, prevention, or 
treatment of a life-threatening, seriously debilitating, or serious and chronic condition when, without incentives, it is unlikely that sales of the drug in the EU 
would be sufficient to justify the necessary investment in developing the medicinal product. Orphan drug designation entitles a party to financial incentives 
such as reduction of fees or fee waivers and 10 years of market exclusivity is granted following medicinal product approval. This period may be reduced to six 
years if the orphan drug designation criteria are no longer met, including where it is shown that the product is sufficiently profitable not to justify 
maintenance of market exclusivity. The applicant will receive a fee reduction for the MAA if the orphan drug designation has been granted, but not if the 
designation is still pending at the time the marketing authorization is submitted, and sponsors must submit an annual report to EMA summarizing the status 
of development of the medicine. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval 
process.
New Chemical Entity Exclusivity 
In the EU, new chemical entities, or NCEs, sometimes referred to as new active substances, qualify for eight years of data exclusivity upon the 
product’s first MA in the EU and an additional two years of market exclusivity. This data exclusivity, if granted, prevents regulatory authorities in the EU from 
referencing the innovator’s data to assess a generic (abbreviated) application for eight years, after which generic marketing authorization can be submitted, 
and the innovator’s data may be referenced, but not approved for two years. The overall ten-year period will be extended to a maximum of eleven years if, 
during the first eight of those ten years, the marketing authorization holder obtains an authorization for one or more new therapeutic indications which, 
during the scientific evaluation prior to their authorization, are held to bring a significant clinical benefit in comparison with existing therapies. Products may 
not be granted data exclusivity since there is no guarantee that a product will be considered by the EU’s regulatory authorities to include an NCE. Even if a 
compound is considered to be a NCE and the MA applicant is able to gain the prescribed period of data exclusivity, another company could market a version 
of the medicinal product if such company can complete a full MAA with its own complete database of pharmaceutical tests, preclinical studies and clinical 
trials and obtain MA of its product.
Post-Approval Requirements 
Drugs manufactured or distributed pursuant to regulatory approvals are subject to pervasive and continuing regulation by the regulatory authorities, 
including, among other things, requirements relating to formal commitments for post approval clinical trials and studies, manufacturing, recordkeeping, 
periodic reporting, product sampling and distribution, marketing, labeling, advertising and promotion and reporting of adverse experiences with the product. 
After approval, most changes to the approved product, such as adding new indications or other labeling claims are subject to prior regulatory authority 
review and approval. 
Drug manufacturers are subject to periodic unannounced inspections by regulatory authorities and country or state agencies for compliance with 
GMP and other requirements. Changes to the manufacturing process are strictly regulated, and, depending on the significance of the change, may require 
prior regulatory approval before being implemented. Regulations also require investigation and correction of any deviations from GMP and impose reporting 
and documentation requirements upon us and any third-party manufacturers that we may decide to use. Accordingly, manufacturers must continue to 
expend time, money, and effort in the area of production and quality control to maintain compliance with GMP and other aspects of regulatory compliance. 
Pharmaceutical Coverage, Pricing and Reimbursement 
In the U.S. and markets in other countries, sales of any products for which we receive regulatory approval for commercial sale will depend in part on 
the availability of coverage and reimbursement from third-party payors. Third-party payors include government authorities, managed care providers, private 
health insurers and other organizations. The process for determining whether a payor will provide coverage for a drug product may be separate from the 
process for setting the reimbursement rate that the payor will pay for the drug product. Third-party payors may limit coverage to specific drug products on 
an approved list, or formulary, which might not include all of the approved drugs for a particular indication. Moreover, a payor’s decision to provide coverage 
for a drug product does not imply that an adequate reimbursement rate will be approved. Adequate third-party reimbursement may not be available to 
enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development. 

 
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In the EU, governments influence the price of pharmaceutical products through their pricing and reimbursement rules and control of national health 
care systems that fund a large part of the cost of those products to patients. Some jurisdictions operate positive and negative list systems under which 
products may only be marketed once a reimbursement price has been agreed to by the government. Other member states allow companies to fix their own 
prices for medicines, but monitor and control company profits, including volume-based arrangements, caps and reference pricing mechanisms. In addition, in 
some countries, cross-border imports from low-priced markets exert a commercial pressure on pricing within a country.
Other Healthcare, Privacy, and Cybersecurity Laws and Compliance Requirements 
We are subject to various laws targeting, among other things, fraud and abuse in the healthcare industry, and privacy and protection of personal 
information, including health information. These laws may impact, among other things, our proposed sales, marketing, and education programs. The laws 
that may affect our ability to operate include: 
•
the federal Anti-Kickback Statute, which prohibits, among other things, persons from knowingly and willfully soliciting or receiving renumeration 
in return for, and from knowingly and willfully offering or paying remuneration to induce, referrals of federal healthcare program patients and 
the purchase or recommendation of an item or service reimbursable under a federal healthcare program, such as the Medicare and Medicaid 
programs; 
•
federal, civil, and criminal false claims laws and civil monetary penalty laws, which prohibit, among other things, individuals or entities from 
knowingly presenting, or causing to be presented to Medicare, Medicaid, or other third-party payers, claims for payment that are false or 
fraudulent;
•
federal, civil, and criminal false claims laws and civil monetary penalty laws, which prohibit, among other things, individuals or entities from 
knowingly presenting, or causing to be presented to Medicare, Medicaid, or other third-party payers, claims for payment that are false or 
fraudulent; 
•
international data protection laws and regulations, including, but not limited, to the EU General Data Protection Regulation, or GDPR, which 
apply to processing of personal data in the context of the activities of an entity established in a respective country, and to processing by an entity 
not established in a particular country, but where such processing is related to the offering of goods or services to, or the monitoring of the 
behavior of individuals located therein, and imposes requirements and limitations relating to the processing, storage, purpose of collection, 
accuracy, security, sharing and transfer of personal data, in particular with respect to special categories of personal data like health data, and the 
notification of supervisory authorities about data breaches, accompanied by sanctioning mechanisms—in addition to the GDPR, EU member 
states may also impose additional requirements in relation to health, genetic and biometric data through their national implementing legislation;
•
the 21st Century Cures Act, or the Cures Act, which introduced a wide range of reforms, such as broadening the types of data required to 
support drug approval, extending protections for generic competition, accelerating approval of breakthrough therapies, expanding the orphan 
drug product program, requiring disclosures about compassionate care programs, and clarifying how manufacturers communicate about their 
products;
•
the federal transparency laws, including the federal Physician Payment Sunshine Act, that requires drug manufacturers to disclose payments and 
other transfers of value provided to various healthcare professionals and teaching hospitals; and
•
state and foreign law equivalents, or similar, of each of the above federal laws, such as transparency laws, anti-kickback and false claims laws 
which may apply to items or services reimbursed by any third-party payer, including commercial insurers, and privacy and security of health 
information laws, including comprehensive privacy and security laws in California. 
Additional Regulation 
The U.S. Foreign Corrupt Practices Act or FCPA, to which we are subject, prohibits corporations and individuals from engaging in certain activities to 
obtain or retain business or to influence a person working in an official capacity. It is illegal to pay, offer to pay or authorize the payment of anything of value 
to any foreign government official, government staff member, political party, or political candidate in an attempt to obtain or retain business or to otherwise 
influence a person working in an official capacity. Similar laws exist in other countries, such as the UK or in EU member states, that restrict improper 
payments to public and private parties. Many countries have laws prohibiting these types of payments within the respective country. In addition to these 
anti-corruption laws, we are subject to import and export control laws, tariffs, trade barriers, economic sanctions, and regulatory limitations on our ability to 
operate in certain foreign markets.

 
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In addition, federal, state, and foreign government bodies and agencies have adopted, are considering adopting, or may adopt laws and regulations 
regarding the collection, use, storage and disclosure of personally identifiable information or other information treated as confidential obtained from 
consumers and individuals.
We are also subject to regulation under the Occupational Safety and Health Act, the Environmental Protection Act, the Toxic Substances Control Act, 
the Resource Conservation and Recovery Act and other present and potential federal, state, or local regulations. These and other laws govern our use, 
handling and disposal of various biological and chemical substances used in, and waste generated by, our operations. Complying with these requirements 
may have a significant impact on our capital expenditures and results of operations.
Customers
Our customers include collaboration partners, drug wholesalers, and retail pharmacy distributors. For the year ended December 31, 2024, 49% of our 
total revenues were generated by our collaboration partner KKC.
Human Capital
General Information
As of December 31, 2024, we had 1,294 total employees, of which 875 are in research and development and 419 are in sales, general, and 
administrative. Further, 1,081 employees are based in the U.S., including at our facilities in Novato, California, Brisbane, California, Cambridge, 
Massachusetts, and Woburn, Massachusetts, and 213 employees are based at our international locations. The majority of new employees hired during the 
year ended December 31, 2024 were to support and extend our clinical and preclinical pipeline, our in-house manufacturing capacities for our GTMF, as well 
as our commercialization activities, with hires in commercial, clinical development and operations, research, manufacturing, and general and administrative 
functions. We believe our relationship with our employees to be generally good. We have not experienced any material employment-related issues or 
interruptions of services due to labor disagreements and are not a party to any collective bargaining agreements. 
We expect to continue to strategically add employees in 2025 with a focus on increasing our commercial expertise and bandwidth for anticipated new 
product launches and expanding our geographic reach in connection with the global launches of our approved products. We continually evaluate our 
business need and opportunity and balances in-house expertise and capacity with outsourced expertise and capacity. Currently, we outsource substantial 
clinical trial work to clinical research organizations and certain drug manufacturing to contract manufacturers.
Workforce Safety and Employee Wellbeing
We maintain a safety culture grounded on the premise of eliminating workplace incidents, risks and hazards. Our health and safety management 
system includes several elements, such as incorporation of Global Environmental, Health, Safety and Sustainability standards, site-specific standard operating 
procedures, incident and safety observation reporting, hazard identification and risk assessments, job safety analyses, ergonomic assessments and industrial 
hygiene evaluations. We have adopted a flexible, hybrid working arrangement for our employees, which allows some of our employees to work remotely 
during certain days of the week. We provide our employees with wellness offerings to support their physical and mental health including our “Caring For U” 
program, a global reimbursement program offering employees up to $1,200 annually (in local currency) for wellness and caregiving activities.
Employee Retention and Engagement
The biotechnology industry is an extremely competitive labor market and we believe our company’s success depends on our ability to attract, 
develop, and retain key personnel. We invest in the growth and development of our employees through various training and development programs that 
build and strengthen employees’ leadership and professional skills, including leadership development programs tailored for new leaders as well as for more 
senior leaders, six sigma certification, as well as a mentoring program. We also have a talent management framework and processes in place that includes 
regularly conducted activities such as performance management, succession, and workforce planning in order to support our employees in their growth and 
development and to provide learning opportunities. We offer on-demand career coaching services through an external network of professional executive 
coaches. We encourage all employees to have an individual development plan to identify focus areas for learning and growth.

 
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To regularly assess and improve our employee retention and engagement, we conduct an engagement survey approximately every 18 months, with 
"pulse" surveys in between, the results of which are discussed with our board of directors, at all hands employee meetings and in individual functions. We 
take actions to address areas of employment concern and follow-up routinely to share with employees what we are doing.
Culture 
We are committed to fostering a healthy, inclusive environment while nurturing a culture of belonging where all employees have equal opportunities. 
We strive to create an environment where everyone we work with, serve, and engage with feels valued, respected, and empowered.
We have included questions in our engagement survey to measure employee perception of our inclusive culture, with the results from such survey on 
inclusion included in our corporate goals. Our business units review data related to hiring, promotions, and retention on an ongoing basis in order to 
promote inclusivity while maintaining our commitment to equal employment opportunities through merit-based decisions.
Benefits and Compensation
We are dedicated to fostering a workplace environment that keeps our employees inspired, including providing a comprehensive benefits program 
that supports the health care, family, and financial needs of our employees. All of our full-time employees are eligible for cash bonuses and equity awards in 
addition to other benefits including comprehensive health insurance, life and disability insurance, 401(k) matching, paid time off for volunteering, wellness 
programs, and tuition reimbursement. We benchmark and tie compensation to market data as well as to an employee’s experience, function and 
performance. Our compensation structure includes performance-based elements, with the goal of recognizing and rewarding exceptional performance. We 
regularly review our compensation policies and practices in an effort to identify and address any disparities or inequities.
General Information 
Our Internet website address is www.ultragenyx.com. No portion of our website, or any other website that may be referenced, is incorporated by 
reference into this Annual Report.
You are advised to read this Annual Report in conjunction with other reports and documents that we file from time to time with the Securities and 
Exchange Commission, or the SEC. In particular, please read our definitive proxy statements, our Annual Reports on Form 10-K, our Quarterly Reports on 
Form 10-Q and any Current Reports on Form 8-K that we may file from time to time. The SEC maintains information for electronic filers (including Ultragenyx) 
at its website at www.sec.gov. We make our annual reports on Form 10-K, our quarterly reports on Form 10-Q, and our current reports on Form 8-K, and 
amendments to those reports, available on our internet website, free of charge, as soon as reasonably practicable after such material is electronically filed 
with, or furnished to, the SEC.
 
Item 1A. Risk Factors 
Investing in our common stock involves a high degree of risk. You should carefully consider the following material risks, together with all the other information 
in this Annual Report, including our financial statements and notes thereto, before deciding to invest in our common stock. The risks and uncertainties 
described below are not the only ones we face. Moreover, some of the factors, events and contingencies discussed below may have occurred in the past, but 
the disclosures below are not representations as to whether or not the factors, events or contingencies have occurred in the past, and instead reflect our 
beliefs and opinions as to the factors, events, or contingencies that could materially and adversely affect us in the future. Additional risk and uncertainties not 
presently known to us or that we presently deem less significant may also impair our business operations. If any of the following risks actually materialize, our 
operating results, financial condition, and liquidity could be materially adversely affected. As a result, the trading price of our common stock could decline and 
you could lose part or all of your investment. Our company’s business, financial condition and operating results can be affected by a number of factors, 
whether currently known or unknown, including but not limited to those described below, any one or more of which could, directly or indirectly, cause our 
actual financial condition and operating results to vary materially from past, or from anticipated future, financial condition and operating results. Any of these 
factors, in whole or in part, could materially and adversely affect our business, prospects, financial condition, operating results and stock price. 
 
Because of the following factors, as well as other factors affecting our financial condition and operating results, past financial performance should not be 
considered to be a reliable indicator of future performance, and investors should not use historical trends to anticipate results or trends in future periods.

 
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Risk Factor Summary
•
We have a history of operating losses and expect to continue to incur operating losses in the near term.
•
We have limited experience in generating revenue from product sales. 
•
We may need to raise additional capital to fund our activities.
•
Clinical drug development is a lengthy, complex, and expensive process with uncertain outcomes. 
•
We may experience delays in commercialization of our products and other adverse effects if we do not achieve our projected development 
goals in the time frames we announce and expect.
•
We may experience difficulty in enrolling patients.
•
The regulatory approval processes of the FDA and comparable foreign authorities are lengthy and inherently unpredictable. 
•
Fast Track Product, Breakthrough Therapy, Priority Review or RMAT designations by the FDA, and analogous designations by the EMA, for our 
product candidates may not lead to faster development or approval. 
•
Our product candidates may cause undesirable or serious side effects.
•
We face a multitude of manufacturing risks, particularly with respect to our gene therapy product candidates.
•
Our products remain subject to regulatory scrutiny even if we obtain regulatory approval.
•
Product liability lawsuits against us could cause us to incur substantial liabilities. 
•
We may not realize the full commercial potential of our product candidates if we are unable to source and develop effective biomarkers. 
•
We rely on third parties to conduct our nonclinical and clinical studies and perform other tasks for us. 
•
We are dependent on KKC for the commercialization of Crysvita in certain major markets, including the U.S. and Canada, and for our supply of 
Crysvita in our markets. 
•
We rely on third parties to manufacture our products and product candidates.
•
The loss of, or failure to supply by, any of any of our single-source suppliers for our drug substance and drug product could adversely affect our 
business.
•
The actions of distributors and specialty pharmacies could affect our ability to sell or market products profitably. 
•
Our revenue may be adversely affected if the market opportunities for our products and product candidates are smaller than expected. 
•
Our competitors may develop therapies that are similar, more advanced, or more effective than ours.
•
We may not successfully manage expansion of our company. 
•
Commercial success of our products depends on the degree of market acceptance.
•
We face uncertainty related to insurance coverage and reimbursement status of our newly approved products.
•
If we, or our third-party partners, are unable to maintain effective proprietary rights for our products or product candidates, we may not be 
able to compete effectively. 
•
Claims of intellectual property infringement may prevent or delay our development and commercialization efforts.
•
We may not be successful in obtaining or maintaining necessary rights to our product candidates through acquisitions and in-licenses.
•
We may face competition from biosimilars of our biologics products and product candidates or from generic versions of our small-molecule 
products and product candidates, which may result in a material decline in sales of affected products. 
•
We could lose license rights that are important to our business if we fail to comply with our obligations in the agreements under which we 
license intellectual property and other rights from third parties. 

 
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•
We may become involved in lawsuits to protect or enforce our patents or the patents of our licensors, or be subject to claims that challenge 
the inventorship or ownership of our patents.
•
Changes to patent laws in the U.S. and other jurisdictions could diminish the value of patents in general, thereby impairing our ability to 
protect our products. 
•
We may not be able to protect our intellectual property rights throughout the world. 
•
We have limited experience as a company operating our own manufacturing facility.
•
Our success depends in part on our ability to retain our President and Chief Executive Officer and other qualified personnel.
•
Our revenue may be impacted if we fail to obtain or maintain orphan drug exclusivity for our products.
•
Our operating results may be adversely impacted if our intangible assets become impaired.
•
We may not be successful in identifying, licensing, developing, or commercializing additional product candidates.
•
We may fail to comply with laws and regulations or changes in laws and regulations could adversely affect our business.
•
We are exposed to risks related to international expansion of our business outside of the U.S.
•
Our employees or consultants may engage in misconduct which could cause significant liability for us. 
•
If we are found to have promoted off-label uses for our products, we may become subject to significant liability from the FDA and other 
regulatory agencies.
•
Our business may be adversely affected in the event of computer system failures or security breaches.
•
We or our third-party partners may be adversely affected by earthquakes or other serious natural disasters.
•
We may incur various costs and expenses and risks related to acquisition of companies or products or strategic transactions.
•
The market price of our common stock is highly volatile. 
•
Future sales and issuances of our common stock could dilute the percentage ownership of our current stockholders and result in a decline in 
stock price.
•
Provisions in our amended and restated certificate of incorporation and by-laws, as well as provisions of Delaware law, could make it more 
difficult for a third party to acquire us or increase the cost of acquiring us or could limit our stockholders’ ability to obtain a favorable judicial 
forum for disputes with us or our directors, officers or employees.
•
We face general risks related to our ability to maintain effective internal controls over financial reporting, additional tax liabilities related to 
our operations, our ability to use our net operating loss carryforwards, costs of litigation, stockholder activism and increased scrutiny regarding 
our ESG practices and disclosures.
Risks Related to Our Financial Condition and Capital Requirements 
We have a history of operating losses and expect to continue to incur operating losses in the near term. 
Since inception, we have been engaged in substantial research and development and capital investments, and we have operated at an operating loss 
each year and expect to continue doing so in the near term. While we currently expect to achieve profitability for the year 2027, our expectations are based 
on a variety of assumptions, and actual results, including whether we achieve profitability on our expected timeline or at all, may materially differ from our 
expectations. Our operating results, including our ability to achieve profitability, will depend, in part, on non-recurring events, the success of our 
commercialization efforts, and the rate of our future expenditures. We anticipate that our expenses will increase substantially if and as we:
•
continue our research and nonclinical and clinical development of our product candidates; 
•
expand the scope of our current clinical studies for our product candidates; 
•
advance our programs into more expensive clinical studies; 
•
initiate additional nonclinical, clinical, or other studies for our product candidates; 
•
pursue preclinical and clinical development for additional indications for existing products and product candidates; 

 
32
•
change or add additional manufacturers or suppliers; 
•
expand upon our manufacturing-related facilities and capabilities, particularly as we continue to increase operations at our GMP gene therapy 
manufacturing facility;
•
seek regulatory and marketing approvals for our product candidates that successfully complete clinical studies; 
•
continue to establish Medical Affairs field teams to initiate relevant disease education;
•
continue to establish or grow a marketing and distribution infrastructure and field force to commercialize our products and any product 
candidates for which we may obtain marketing approval; 
•
continue to manage our international subsidiaries and establish new ones;
•
continue to operate as a public company and comply with legal, accounting and other regulatory requirements;
•
seek to identify, assess, license, acquire, and/or develop other product candidates, technologies, and/or businesses; 
•
make milestone or other payments under any license or other agreements; 
•
seek to maintain, protect, and expand our intellectual property portfolio; 
•
seek to attract and retain skilled personnel; 
•
create additional infrastructure, including facilities and systems, to support the growth of our operations, our product development, and our 
commercialization efforts; and
•
experience any delays or encounter issues with any of the above, including, but not limited to, failed studies, complex results, safety issues, 
inspection outcomes, or other regulatory challenges that require longer follow-up of existing studies, additional major studies, or additional 
supportive studies in order to pursue marketing approval.
Even if we do achieve profitability, we may not be able to sustain or increase such profitability on a quarterly or yearly basis. Our operating results 
may fluctuate significantly from quarter to quarter and year to year, such that a period-to-period comparison of our results of operations may not be a good 
indication of our future performance. 
We have limited experience in generating revenue from product sales. 
Our ability to generate significant revenue from product sales depends on our ability, alone or with strategic collaboration partners, to successfully 
commercialize our products and to complete the development of, and obtain the regulatory and marketing approvals necessary to commercialize, our 
product candidates. Our ability to generate substantial future revenue from product sales, including named patient sales, depends heavily on our success in 
many areas, including, but not limited to: 
•
obtaining regulatory and marketing approvals with broad indications for product candidates for which we complete clinical studies; 
•
developing a sustainable and scalable manufacturing process for our products and any approved product candidates and establishing and 
maintaining supply and manufacturing relationships with third parties that can conduct the processes and provide adequate (in amount and 
quality) product supply to support market demand for our products and product candidates, if approved; 
•
launching and commercializing our products and product candidates for which we obtain regulatory and marketing approval, either directly or 
with a collaborator or distributor; 
•
obtaining market acceptance of our products and product candidates as viable treatment options; 
•
obtaining adequate market share, reimbursement and pricing for our products and product candidates;
•
our ability to sell our products and product candidates on a named patient basis or through an equivalent mechanism and the amount of 
revenue generated from such sales;
•
our ability to find patients so they can be diagnosed and begin receiving treatment;
•
addressing any competing technological and market developments; 
•
negotiating favorable terms, including commercial rights, in any collaboration, licensing, or other arrangements into which we may enter, any 
amendments thereto or extensions thereof; 

 
33
•
maintaining, protecting, and expanding our portfolio of intellectual property rights, including patents, trade secrets, and know-how; and 
•
attracting, hiring, and retaining qualified personnel. 
If the number of our addressable rare disease patients is not as significant as we estimate, the indication approved by regulatory authorities is 
narrower than we expect, or the reasonably accepted population for treatment is narrowed by competition, physician choice, or treatment guidelines, or any 
other reasons, we may not generate significant revenue from sales of our products, even if they receive regulatory approval.
We may need to raise additional capital to fund our activities. Such additional financing may not be available on acceptable terms, if at all. Failure to 
obtain this necessary capital when needed may force us to delay, limit, or terminate our product development efforts or other activities. 
As of December 31, 2024, our available cash, cash equivalents, and marketable debt securities were $745.0 million. We may need additional capital to 
continue to commercialize our products, and to develop, obtain regulatory approval for, and to commercialize, all of our product candidates. In addition, our 
operating plans may change as a result of many factors that may currently be unknown to us, and we may need to seek additional funds sooner than 
planned. Our future funding requirements will depend on many factors, including but not limited to: 
•
the scope, rate of progress, results, and cost of our clinical studies, nonclinical testing, and other related activities; 
•
the cost of manufacturing clinical and commercial supplies of our products and product candidates; 
•
the cost of creating additional infrastructure, including facilities and systems, such as systems in our GMP gene therapy manufacturing facility; 
•
the cost of operating and maintaining our gene therapy manufacturing facility; 
•
the number and characteristics of the product candidates that we pursue; 
•
the cost, timing, and outcomes of regulatory approvals; 
•
the cost and timing of establishing and operating our international subsidiaries;
•
the cost and timing of establishing and operating field forces, marketing, and distribution capabilities; 
•
the cost and timing of other activities needed to commercialize our products; and 
•
the terms and timing of any collaborative, licensing, acquisition, and other arrangements that we may establish, including any required 
milestone, royalty, and reimbursements or other payments thereunder.
Any additional fundraising efforts may divert our management’s attention from their day-to-day activities, which can adversely affect our ability to 
develop our product candidates and commercialize our products. In addition, we cannot guarantee that future financing will be available in sufficient 
amounts or on terms acceptable to us, if at all, particularly in light of the current macroeconomic conditions, including changing interest rates and inflation. 
The terms of any financing may adversely affect the holdings or the rights of our stockholders and the issuance of additional securities by us, whether equity 
or debt, or the possibility of such issuance, may cause the market price of our shares to decline. The sale of additional equity or convertible securities would 
dilute all of our stockholders. If we incur debt, it could result in increased fixed payment obligations and we may be required to agree to certain restrictive 
covenants, such as limitations on our ability to incur additional debt, limitations on our ability to acquire, sell, or license intellectual property rights, and other 
operating restrictions that could adversely impact our ability to conduct our business. We have in the past sought and may in the future seek funds through a 
sale of future royalty payments similar to our transactions with Royalty Pharma and OMERS or through collaborative partnerships, strategic alliances, and 
licensing or other arrangements, such as our transaction with Daiichi Sankyo Co., Ltd., or Daiichi Sankyo, and we may be required to relinquish rights to some 
of our technologies or product candidates, future revenue streams, research programs, and other product candidates or otherwise agree to terms 
unfavorable to us, any of which may have a material adverse effect on our business, operating results, and prospects. Even if we believe we have sufficient 
funds for our current or future operating plans, we may seek additional capital if market conditions are favorable or if we have specific strategic 
considerations.
In addition, we purchase or enter into a variety of financial instruments and transactions, including investments in commercial paper, the extension of 
credit to corporations, institutions and governments. If any of the issuers or counterparties to these instruments were to default on their obligations, it could 
materially reduce the value of the transaction and adversely affect our cash flows.

 
34
If our cash flows are materially and adversely affected or if we are unable to access our existing cash, cash equivalents and investments and/or are 
unable to obtain funding on a timely basis, or at all, we may be required to significantly curtail, delay, or discontinue one or more of our research or 
development programs or the commercialization of our products and any approved product candidates or be unable to expand our operations or otherwise 
capitalize on our business opportunities, as desired, which could materially affect our business, financial condition, and results of operations.
Risks Related to the Discovery and Development of Our Product Candidates 
Clinical drug development involves a lengthy, complex, and expensive process with uncertain outcomes and the potential for substantial delays, and the 
results of earlier studies may not be predictive of future study results. 
Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must conduct extensive clinical studies to 
demonstrate the safety and efficacy of the product candidates in humans. Clinical testing is expensive, complex, time consuming, and uncertain as to 
outcome. We cannot guarantee that any clinical studies will be conducted as planned or completed on schedule, if at all. We have also had difficulties in 
recruiting clinical site investigators and clinical staff for our studies, and may continue to experience such difficulties. Additionally, a failure of one or more 
clinical studies can occur at any stage of testing, and our future clinical studies may not be successful. Product candidates that have shown promising results 
in early-stage clinical studies may still suffer significant setbacks or fail in subsequent clinical studies. The safety or efficacy results generated to date in 
clinical studies do not ensure that later clinical studies will demonstrate similar results. Further, we have reported and expect to continue to report 
preliminary or interim data from our clinical trials. Preliminary or interim data from our clinical trials are subject to the risk that one or more of the clinical 
outcomes may materially change as patient enrollment continues and/or more patient data become available. Such data may show initial evidence of clinical 
benefit, but as patients continue to be assessed and more patient data become available, there is a risk that any therapeutic effects are no longer durable in 
patients and/or decrease over time or cease entirely. As a result, preliminary or interim data should be considered carefully and with caution until the final 
data are available. Results from investigator-sponsored studies or compassionate-use studies may not be confirmed in company-sponsored studies or may 
negatively impact the prospects for our programs. Additionally, given the nature of the rare diseases we are seeking to treat, we often devise newly-defined 
endpoints to be tested in our studies, which can lead to subjectivity in interpreting study results and could result in regulatory agencies not agreeing with the 
validity of our endpoints, or our interpretation of the clinical data, and therefore delaying or denying approval. Given the illness of the patients in our studies 
and the nature of their rare diseases, we have also been required to, or have chosen to, conduct certain studies on an open-label basis. We have in the past, 
and may in the future, elect to review interim clinical data at multiple time points during the studies, which could introduce bias into the study results and 
potentially result in denial of approval.
In the biopharmaceutical industry, there is a high failure rate for drugs and biologics proceeding through clinical studies, and product candidates in 
later stages of clinical studies may fail to show the desired safety and efficacy despite having progressed through nonclinical studies and initial clinical studies. 
A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical studies due to lack of efficacy or adverse 
safety profiles, notwithstanding promising results in earlier studies.
Scenarios that can prevent successful or timely completion of clinical development include but are not limited to:
•
delays or failures in generating sufficient preclinical, toxicology, or other in vivo or in vitro data to support the initiation or continuation of human 
clinical studies or filings for regulatory approval; 
•
failure to demonstrate a starting dose for our product candidates in the clinic that might be reasonably expected to result in a clinical benefit;
•
delays or failures in developing gene therapy, or other novel and complex product candidates, which are expensive and difficult to develop and 
manufacture;
•
delays resulting from a shutdown, or uncertainty surrounding the potential for future shutdowns of the U.S. government, including the FDA;
•
delays or failures in reaching a consensus with regulatory agencies on study design; 
•
delays in reaching agreement on acceptable terms with contract research organizations, or CROs, clinical study sites, and other clinical trial-
related vendors; 
•
failure or delays in obtaining required regulatory agency approval and/or IRB or EC approval at each clinical study site or in certain countries; 
•
failure to correctly design clinical studies which may result in those studies failing to meet their endpoints or the expectations of regulatory 
agencies;

 
35
•
changes in clinical study design or development strategy resulting in delays related to obtaining approvals from IRBs or ECs and/or regulatory 
agencies to proceed with clinical studies; 
•
imposition of a clinical hold by regulatory agencies after review of an IND application or amendment, another equivalent application or 
amendment, or an inspection of our clinical study operations or study sites; 
•
delays in recruiting suitable patients to participate in our clinical studies; 
•
difficulty collaborating with patient groups and investigators; 
•
failure by our CROs, other third parties, or us to adhere to clinical study requirements; 
•
failure to perform in accordance with the FDA’s and/or ICH’s good clinical practices requirements or applicable regulatory guidelines in other 
countries; 
•
delays in patients’ completion of studies or their returns for post-treatment follow-up; 
•
patients dropping out of a study; 
•
adverse events associated with the product candidate occurring that are viewed to outweigh its potential benefits; 
•
changes in regulatory requirements and guidance that require amending or submitting new clinical protocols; 
•
greater than anticipated costs associated with clinical studies of our drug candidates, including as a result of inflation; 
•
clinical studies of our drug candidates producing negative or inconclusive results, which may result in us deciding, or regulators requiring us, to 
conduct additional clinical or nonclinical studies or to abandon drug development programs; 
•
competing clinical studies of potential alternative product candidates or investigator-sponsored studies of our product candidates; and 
•
delays in manufacturing, testing, releasing, validating, or importing/exporting sufficient stable quantities of our product candidates for use in 
clinical studies or the inability to do any of the foregoing.
Any inability to successfully complete nonclinical and clinical development could result in additional costs to us or negatively impact our ability to 
generate revenue. In addition, if we make manufacturing or formulation changes to our product candidates, we may need to conduct additional toxicology, 
comparability or other studies to bridge our modified product candidates to earlier versions. Clinical study delays could also shorten any periods during 
which our products have commercial exclusivity and may allow our competitors to bring products to market before we do, which could negatively impact our 
ability to obtain orphan exclusivity and to successfully commercialize our product candidates and may harm our business and results of operations.
If we do not achieve our projected development goals in the time frames we announce and expect, the commercialization of our products may be delayed 
and the credibility of our management may be adversely affected and, as a result, our stock price may decline.
For planning purposes, we estimate the timing of the accomplishment of various scientific, clinical, regulatory, and other product development goals, 
which we sometimes refer to as milestones. These milestones may include the commencement or completion of scientific studies and clinical trials, the 
timing of patient dosing, the timing, type or clarity of data from clinical trials, the submission or acceptance of regulatory filings, and the potential approval of 
such regulatory filings. We periodically make public announcements about the expected timing of some of these milestones. All of these milestones are 
based on a variety of assumptions, but the actual timing of these milestones can vary dramatically from our estimates. If we do not meet these publicly 
announced milestones, the commercialization of our products may be delayed and the credibility of our management may be adversely affected and, as a 
result, our stock price may decline.
We may find it difficult to identify and enroll patients in our clinical studies due to a variety of factors, including the limited number of patients who have 
the diseases for which our product candidates are being studied and other unforeseen events. Difficulty in enrolling patients could delay or prevent clinical 
studies of our product candidates. 
Identifying and qualifying patients to participate in clinical studies of our product candidates is critical to our success. The timing of our clinical studies 
depends in part on the speed at which we can recruit patients to participate in testing our product candidates, and we may experience delays in our clinical 
studies if we encounter difficulties in enrollment.
Each of the conditions for which we plan to evaluate our current product candidates is a rare genetic disease. Accordingly, there are limited patient 
pools from which to draw for clinical studies. For example, we estimate that approximately 6,000 patients worldwide suffer from GSDIa, for which DTX401 is 
being studied, and these all may not be treatable if they are immune to the AAV viral vector.

 
36
In addition to the rarity of these diseases, the eligibility criteria of our clinical studies will further limit the pool of available study participants as we 
will require patients to have specific characteristics that we can measure or to assure their disease is either severe enough or not too advanced to include 
them in a study. The process of finding and diagnosing patients is costly and time-consuming, especially since the rare diseases we are studying are 
commonly underdiagnosed. We also may not be able to identify, recruit, and enroll a sufficient number of appropriate patients to complete our clinical 
studies because of demographic criteria for prospective patients, the perceived risks and benefits of the product candidate under study, the proximity and 
availability of clinical study sites for prospective patients, and the patient referral practices of physicians. The availability and efficacy of competing therapies 
and clinical studies can also adversely impact enrollment. If patients are unwilling to participate in our studies for any reason (such as drug-related side 
effects), the timeline for and our success in recruiting patients, conducting studies, and obtaining regulatory approval of potential products may be delayed 
or impaired, the commercial prospects of our product candidates will be harmed, and our ability to generate product sales from any of these product 
candidates could be delayed or prevented. Delays in completing our clinical studies will increase our costs, slow down our product candidate development 
and approval process, and jeopardize our ability to commence product sales and generate revenue.
The regulatory approval processes of the FDA and comparable foreign authorities are lengthy, time consuming, and inherently unpredictable. Even if we 
achieve positive results in our pre-clinical and clinical studies, if we are ultimately unable to obtain timely regulatory approval for our product candidates, 
our business will be substantially harmed.
Our future success is dependent on our ability to successfully commercialize our products and develop, obtain regulatory approval for, and then 
successfully commercialize one or more product candidates. We are not permitted to market or promote any of our product candidates before we receive 
regulatory approval from the FDA or comparable foreign regulatory authorities. We have only obtained regulatory approval for three products that we have 
developed, and it is possible that none of our existing product candidates or any product candidates we may seek to develop in the future will ever obtain 
regulatory approval. Further, as the clinical trial requirements of regulatory authorities and the criteria these regulators use to determine the safety and 
efficacy of a product candidate vary substantially according to the type, complexity, novelty and intended use and market of the product candidates, the 
regulatory approval process for novel product candidates, such as our gene therapy product candidates, can be more expensive and take longer than for 
other product candidates, leading to fewer product approvals. To date, very few gene therapy products have received regulatory approval in the U.S. or 
Europe. The regulatory framework and oversight over development of gene therapy products has evolved and may continue to evolve in the future. Within 
the FDA, the Center for Biologics Evaluation and Research, or CBER, regulates gene therapy products. Within the CBER, the review of gene therapy and 
related products is consolidated in the Office of Cellular, Tissue and Gene Therapies, and the FDA has established the Cellular, Tissue and Gene Therapies 
Advisory Committee to advise CBER on its reviews. The CBER works closely with the National Institutes of Health, or NIH. The FDA and the NIH have published 
guidance with respect to the development and submission of gene therapy protocols. For example, in January 2020, the FDA issued final guidance to set 
forth the framework for the development, review and approval of gene therapies. The final guidance pertains to the development of gene therapies for the 
treatment of specific disease categories, including rare diseases, and to manufacturing and long-term follow up issues relevant to gene therapy, among other 
topics. At the same time the FDA issued guidance describing the FDA’s approach for determining whether two gene therapy products were the same or 
different for the purpose of assessing orphan drug exclusivity. Within the European Medicines Agency, or EMA, special rules apply to gene therapy and 
related products as they are considered advanced therapy medicinal products, or ATMPs. Pursuant to the ATMP Regulation, the Committee on Advanced 
Therapies, or CAT, is responsible in conjunction with the Committee for Medicinal Products for Human Use, or CHMP, for the evaluation of ATMPs. The 
CHMP and CAT are also responsible for providing guidelines on ATMPs. These guidelines provide additional guidance on the factors that the EMA will 
consider in relation to the development and evaluation of ATMPs and include, among other things, the preclinical studies required to characterize ATMPs. 
The manufacturing and control information that should be submitted in a MAA; and post-approval measures required to monitor patients and evaluate the 
long-term efficacy and potential adverse reactions of ATMPs. Although such guidelines are not legally binding, compliance with them is often necessary to 
gain and maintain approval for product candidates. In addition to the mandatory risk-management plan, or RMP, the holder of a marketing authorization for 
an ATMP must put in place and maintain a system to ensure that each individual product and its starting and raw materials, including all substances coming 
into contact with the cells or tissues it may contain, can be traced through the sourcing, manufacturing, packaging, storage, transport, and delivery to the 
relevant healthcare institution where the product is used.

 
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To obtain regulatory approval in the U.S. and other jurisdictions, we must comply with numerous and varying requirements regarding safety, efficacy, 
chemistry, manufacturing and controls, clinical studies (including good clinical practices), commercial sales, pricing, and distribution of our product 
candidates, as described above in “Item 1. Business – Government Regulation”. Even if we are successful in obtaining approval in one jurisdiction, we cannot 
ensure that we will obtain approval in any other jurisdictions. In addition, approval policies, regulations, positions of the regulatory agencies on study design 
and/or endpoints, or the type and amount of clinical data necessary to gain approval may change during the course of a product candidate’s clinical 
development, which may cause delays in the approval or the decision not to approve an application. Communications with the regulatory agencies during 
the approval process are also unpredictable; favorable communications early in the process do not ensure that approval will be obtained and unfavorable 
communications early on do not guarantee that approval will be denied. Applications for our product candidates could fail to receive regulatory approval, or 
could be delayed in receiving regulatory approval, for many reasons, including but not limited to the following:
•
regulatory authorities may disagree with the design, implementation, or conduct of our clinical studies; 
•
regulatory authorities may change their guidance or requirements for a development program for a product candidate;
•
the population studied in the clinical program may not be sufficiently broad or representative to assure efficacy and safety in the full population 
for which we seek approval; 
•
regulatory authorities may disagree with our interpretation of data from nonclinical studies or clinical studies; 
•
the data collected from clinical studies of our product candidates may not be sufficient to support the submission of an NDA, or biologics license 
application, or BLA, or other submission or to obtain regulatory approval; 
•
we may be unable to demonstrate to regulatory authorities that a product candidate’s risk-benefit ratio for its proposed indication is acceptable; 
•
regulatory authorities may fail to approve the manufacturing processes, test procedures and specifications, or facilities used to manufacture our 
clinical and commercial supplies; 
•
the U.S. government may be shut down, which could delay the FDA;
•
the FDA may be delayed in responding to our applications or submissions due to competing priorities or limited resources, including as a result of 
the lack of FDA funding or personnel;
•
failure of our nonclinical or clinical development to comply with an agreed upon Pediatric Investigational Plan, or PIP, which details the designs 
and completion timelines for nonclinical and clinical studies and is a condition of marketing authorization in the EU; and 
•
the approval policies or regulations of regulatory authorities may significantly change in a manner rendering our clinical data insufficient for 
approval. 
Furthermore, the disease states we are evaluating often do not have clear regulatory paths for approval and/or do not have validated outcome 
measures. In these circumstances, we work closely with the regulatory authorities to define the approval path and may have to qualify outcome measures as 
part of our development programs. Additionally, many of the disease states we are targeting are highly heterogeneous in nature, which may impact our 
ability to determine the treatment benefit of our potential therapies. 
This lengthy and uncertain approval process, as well as the unpredictability of the clinical and nonclinical studies, may result in our failure to obtain 
regulatory approval to market any of our product candidates, or delayed regulatory approval.
Fast Track, Breakthrough Therapy, Priority Review, or Regenerative Medicine Advanced Therapy, or RMAT, designations by the FDA, or access to the 
Priority Medicine scheme, or PRIME, by the EMA, for our product candidates, if granted, may not lead to 

 
38
faster development or regulatory review or approval process, and it does not increase the likelihood that our product candidates will receive marketing 
approval.
As described in “Item 1. Business – Government Regulation”, we seek Fast Track, Breakthrough Therapy designation, RMAT designation, PRIME 
scheme access or Priority Review designation for our product candidates if supported by the results of clinical trials. Designation as a Fast Track product, 
Breakthrough Therapy, RMAT, PRIME, or Priority Review product is within the discretion of the relevant regulatory agency. Accordingly, even if we believe 
one of our product candidates meets the criteria for designation as a Fast Track product, Breakthrough Therapy, RMAT, PRIME, or Priority Review product, 
the agency may disagree and instead determine not to make such designation. The receipt of such a designation for a product candidate also may not result 
in a faster development process, review or approval compared to drugs considered for approval under conventional regulatory procedures and does not 
assure that the product will ultimately be approved by the regulatory authority. In addition, regarding Fast Track products and Breakthrough Therapies, the 
FDA may later decide that the products no longer meet the conditions for qualification as either a Fast Track product, RMAT, or a Breakthrough Therapy or, 
for Priority Review products, decide that period for FDA review or approval will not be shortened. Furthermore, with respect to PRIME designation by the 
EMA, PRIME eligibility does not change the standards for product approval, and there is no assurance that any such designation or eligibility will result in 
expedited review or approval.
The FDA Rare Pediatric Disease Priority Review Voucher Program, or PRV Voucher Program, awards Priority Review Vouchers, or PRVs, to sponsors of 
rare pediatric product applications that meet certain criteria. Under the program, a company that receives an approval for a product for a rare pediatric 
disease (as determined by the applicable regulations) may qualify for a PRV that can be redeemed to receive Priority Review of a subsequent marketing 
application for a different product. PRVs may also be sold by the company to third parties. We received PRVs under the PRV Voucher Program in connection 
with the approval of Mepsevii and Crysvita in 2018 and subsequently sold these two PRVs to third parties for an average amount of $105.3 million for each 
PRV. The PRV Voucher Program began to sunset on December 20, 2024 such that the FDA may only award a PRV for a product application if a company 
received the rare pediatric disease designation from the FDA for the product candidate by December 20, 2024 and the FDA will cease awarding PRVs after 
September 30, 2026. Renewal of the PRV Voucher Program is subject to approval by Congress and it is currently uncertain whether the program will be 
renewed and whether any such renewal will be retroactively effective. If the PRV program is not renewed by Congress and our qualifying product candidates 
are approved by the FDA after the deadline of September 30, 2026, we will not be eligible to receive additional PRVs for our product candidates and 
accordingly, we would be unable to use such PRV for Priority Review for another one of our programs or to sell such PRV, which sale has the potential to 
generate significant proceeds.
Our product candidates may cause undesirable side effects or have other properties that could delay or prevent their regulatory approval, limit the 
commercial profile of an approved label, or result in significant negative consequences following marketing approval, if any. 
Undesirable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay, or halt clinical studies or 
further development, and could result in a more restrictive label, the delay or denial of regulatory approval by the FDA or other comparable foreign 
authorities, or a Risk Evaluation and Mitigation Strategy, or REMS, plan, which could include a medication guide outlining the risks of such side effects for 
distribution to patients, restricted distribution, a communication plan for healthcare providers, and/or other elements to assure safe use. Our product 
candidates are in development and the safety profile has not been established. Further, as one of the goals of Phase 1 and/or Phase 2 clinical trials is to 
identify the highest dose of treatment that can be safely provided to study participants, adverse side effects, including serious adverse effects, have occurred 
in certain studies as a result of changes to the dosing regimen during such studies and may occur in future studies. Results of our studies or investigator-
sponsored trials could reveal a high and unacceptable severity and prevalence of these or other side effects. In such an event, our studies could be 
suspended or terminated, and the FDA or comparable foreign regulatory authorities could order us to cease further development of or deny or withdraw 
approval of our product candidates for any or all targeted indications. 
Additionally, notwithstanding our prior or future regulatory approvals for our product candidates, if we or others later identify undesirable side effects 
caused by such products, a number of potentially significant negative consequences could result, including but not limited to:
•
regulatory authorities may withdraw approvals of such product; 
•
regulatory authorities may require additional warnings on the product’s label or restrict the product’s approved use; 
•
we may be required to create a REMS plan; 
•
we may be required to change the way the product is administered;

 
39
•
patients and physicians may elect not to use our products, or reimbursement authorities may elect not to reimburse for them; and 
•
our reputation may suffer. 
Any of these events could prevent us from achieving or maintaining market acceptance of the particular product candidate, if approved. 
Serious adverse events in clinical trials involving gene therapy product candidates may damage public perception of the safety of our product candidates, 
increase government regulation, and adversely affect our ability to obtain regulatory approvals for our product candidates or conduct our business.
Gene therapy remains a novel technology. Public perception may be influenced by claims that gene therapy is unsafe, and gene therapy may not gain 
the acceptance of the public or the medical community. For example, certain gene therapy trials using AAV8 vectors (although at significantly higher doses 
than those used in our gene therapy product candidates) and other vectors led to several well-publicized adverse events, including cases of leukemia and 
death. The risk of cancer or death remains a concern for gene therapy and there can be no assurance that it will not occur in any of our planned or future 
clinical studies. In addition, there is the potential risk of delayed adverse events following exposure to gene therapy products due to persistent biological 
activity of the genetic material or other components of products used to carry the genetic material. Serious adverse events in our clinical trials, or other 
clinical trials involving gene therapy products, particularly AAV gene therapy products such as candidates based on the same capsid serotypes as our product 
candidates, or occurring during use of our competitors’ products, even if not ultimately attributable to the relevant product candidates, and the resulting 
publicity, could result in increased government regulation, unfavorable public perception, potential regulatory delays in the testing or approval of our gene 
therapy product candidates, stricter labeling requirements for those gene therapy product candidates that are approved and a decrease in demand for any 
such gene therapy product candidates. 
Gene therapy product candidates are novel, complex, expensive and difficult to manufacture. We could experience manufacturing problems that result in 
delays in developing and commercializing these programs or otherwise harm our business. 
The manufacturing process used to produce our gene therapy product candidates is novel, complex, and has not been validated for commercial use. 
Several factors could cause production interruptions, including equipment malfunctions, malfunctions of internal information technology systems, regulatory 
inspections, facility contamination, raw material shortages or contamination, natural disasters, geopolitical instability, disruption in utility services, human 
error or disruptions in the operations of our suppliers. Further, given that cGMP gene therapy manufacturing is a nascent industry, there are a small number 
of CMOs with the experience necessary to manufacture our gene therapy product candidates and we may have difficulty finding or maintaining relationships 
with such CMOs or hiring experts for internal manufacturing and accordingly, our production capacity may be limited.
Our gene therapy product candidates require processing steps that are more complex than those required for most small molecule drugs. Moreover, 
unlike small molecules, the physical and chemical properties of a biologic such as gene therapy product candidates generally cannot be fully characterized. As 
a result, assays of the finished product candidate may not be sufficient to ensure that the product candidate is consistent from lot to lot or will perform in the 
intended manner. Accordingly, we employ multiple steps to control the manufacturing process to assure that the process works reproducibly, and the 
product candidate is made strictly and consistently in compliance with the process. Problems with the manufacturing process, even minor deviations from 
the normal process, could result in product defects or manufacturing failures that result in lot failures, noncompliance with regulatory requirements, product 
recalls, product liability claims or insufficient inventory. We may encounter problems achieving adequate quantities and quality of clinical-grade materials 
that meet FDA, the EMA or other applicable standards or specifications with consistent and acceptable production yields and costs.
In addition, FDA, the EMA and other foreign regulatory authorities may require us to submit samples of any lot of any approved product together with 
the protocols showing the results of applicable tests at any time. Under some circumstances, FDA, the EMA or other foreign regulatory authorities may 
require that we not distribute a lot until the agency authorizes its release. Slight deviations in the manufacturing process, including those affecting quality 
attributes and stability, may result in unacceptable changes in the product that could result in lot failures or product recalls. Lot failures or product recalls 
could cause us to delay product launches or clinical trials, which could be costly to us and otherwise harm our business, financial condition, results of 
operations and prospects. 
Even if we obtain regulatory approval for our product candidates, our products remain subject to regulatory scrutiny. 

 
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Our products and any product candidates that are approved in the future remain subject to ongoing regulatory requirements for manufacturing, 
labeling, packaging, storage, distribution, advertising, promotion, sampling, record-keeping, conduct of post-marketing studies, and submission of safety, 
efficacy, and other post-market information, including both federal and state requirements in the U.S. and requirements of comparable foreign regulatory 
authorities, as described above in “Item 1. Business – Government Regulation”. 
Manufacturers and manufacturers’ facilities are required to comply with extensive FDA, and comparable foreign regulatory authority, requirements, 
including ensuring that quality control and manufacturing procedures conform to Good Manufacturing Practices, or GMP, regulations. As such, we and our 
contract manufacturers are subject to continual review and inspection to assess compliance with GMP and adherence to commitments made in any NDA, 
BLA, MAA, or other comparable application for approval in another jurisdiction. Although we are not involved in the day-to-day operations of our contract 
manufacturers, we are ultimately responsible for ensuring that our products are manufactured in accordance with GMP regulations. Regulatory authorities 
may, at any time, audit or inspect a manufacturing facility involved with the preparation of our products, product candidates or the associated quality 
systems for compliance with the regulations applicable to the activities being conducted. Due to the complexity of the processes used to manufacture our 
products and product candidates, we or any of our collaborators or contract manufacturers may be unable to comply with GMP regulations in a cost-
effective manner and may be unable to initially or continue to pass a federal, national or international regulatory inspection. If we, our collaborators, such as 
KKC or Regeneron, or any of our third-party manufacturers fail to maintain regulatory compliance, the FDA or other applicable regulatory authority can 
impose regulatory sanctions including, among other things, warning or untitled letters, fines, unanticipated compliance expenses, the temporary or 
permanent suspension of a clinical study or commercial sales, recalls or seizures of product or the temporary or permanent closure of a facility or withdrawal 
of product approval, enforcement actions and criminal or civil prosecution. If supply from one approved manufacturer is interrupted due to failure to 
maintain regulatory compliance, an alternative manufacturer would need to be qualified through an NDA or BLA supplement or MAA variation, or equivalent 
foreign regulatory filing, which could result in delays in product supply. The regulatory agencies may also require additional studies if a new manufacturer, 
material, testing method or standard is relied upon for commercial production. Switching manufacturers, materials, test methods or standards may involve 
substantial costs and may result in a delay in our desired clinical and commercial timelines. Accordingly, we and others with whom we work are required 
continue to expend time, money, and effort in all areas of regulatory compliance, including manufacturing, production, and quality control.
Any regulatory approvals that we receive for our product candidates may be subject to limitations on the approved indicated uses for which the 
product may be marketed or other conditions of approval, or contain requirements for potentially costly post-marketing testing, including Phase 4 clinical 
studies, and surveillance to monitor the safety and efficacy of the product candidate. We could also be asked to conduct post-marketing clinical studies to 
verify the safety and efficacy of our products in general or in specific patient subsets. If original marketing approval was obtained via the accelerated approval
or conditional marketing authorization pathways, we would be required to conduct a successful post-marketing clinical study to confirm clinical benefit for 
our products. An unsuccessful post-marketing study or failure to complete such a study could result in the withdrawal of marketing approval. We will be 
required to report certain adverse events and manufacturing problems, if any, to the FDA and comparable foreign regulatory authorities. The holder of an 
approved NDA, BLA, MAA, or other comparable application must submit new or supplemental applications and obtain approval for certain changes to the 
approved product, product labeling, or manufacturing process. 
If we fail to comply with applicable regulatory requirements, or there are safety or efficacy problems with a product, a regulatory agency or 
enforcement authority may, among other things: 
•
issue warning or notice of violation letters; 
•
impose civil or criminal penalties; 
•
suspend or withdraw regulatory approval; 
•
suspend any of our ongoing clinical studies; 
•
refuse to approve pending applications or supplements to approved applications submitted by us; 
•
impose restrictions on our operations, including closing our contract manufacturers’ facilities; 
•
seize or detain products, or require a product recall; or
•
require entry into a consent decree.
Any government investigation of alleged violations of law could require us to expend significant time and resources in response, and could generate 
negative publicity. Any failure to comply with ongoing regulatory requirements may significantly and adversely affect our ability to commercialize and 
generate revenue from our products. If regulatory sanctions are applied or if regulatory approval is withdrawn, the value of our company and our operating 
results will be adversely affected. 

 
41
Product liability lawsuits against us could cause us to incur substantial liabilities and could limit commercialization of our approved products or product 
candidates. 
We face an inherent risk of product liability exposure related to the testing of our approved products and product candidates in human clinical trials, 
as well as in connection with commercialization of our current and future products. If we cannot successfully defend ourselves against claims that any of our 
approved products or product candidates caused injuries, we could incur substantial liabilities. There can be no assurance that our product liability insurance, 
which provides coverage in the amount of $15.0 million in the aggregate, will be sufficient in light of our current or planned clinical programs. We may not be 
able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability, or losses may exceed the 
amount of insurance that we carry. A product liability claim or series of claims brought against us could cause our stock price to decline and, if judgments 
exceed our insurance coverage, could adversely affect our results of operations and business. In addition, regardless of merit or eventual outcome, product 
liability claims may result in impairment of our business reputation, withdrawal of clinical study participants, costs due to related litigation, distraction of 
management’s attention from our primary business, initiation of investigations by regulators, substantial monetary awards to patients or other claimants, the 
inability to commercialize our product candidates, and decreased demand for our product candidates, if approved for commercial sale.
If we are unable to identify, source, and develop effective biomarkers, or our collaborators are unable to successfully develop and commercialize 
companion diagnostics for our product candidates, or experience significant delays in doing so, we may not realize the full commercial potential of our 
product candidates.
We are developing companion diagnostic tests to identify the right patients for certain of our product candidates and to monitor response to 
treatment. In certain cases, diagnostic tests may need to be developed as companion diagnostics and regulatory approval obtained in order to commercialize 
some product candidates. We currently use and expect to continue to use biomarkers to identify the right patients for certain of our product candidates. We 
may also need to develop predictive biomarkers in the future. We can offer no assurances that any current or future potential biomarker will in fact prove 
predictive, be reliably measured, or be accepted as a measure of efficacy by the FDA or other regulatory authorities. In addition, our success may depend, in 
part, on the development and commercialization of companion diagnostics. We also expect the FDA will require the development and regulatory approval of 
a companion diagnostic assay as a condition to approval of our gene therapy product candidates. There has been limited success to date industrywide in 
developing and commercializing these types of companion diagnostics. Development and manufacturing of companion diagnostics is complex and there are 
limited manufacturers with the necessary expertise and capability. Even if we are able to successfully develop companion diagnostics, we may not be able to 
manufacture the companion diagnostics at a cost or in quantities or on timelines necessary for use with our product candidates. To be successful, we need to 
address a number of scientific, technical and logistical challenges. We are currently working with a third party to develop companion diagnostics, however, 
we have little experience in the development and commercialization of diagnostics and may not ultimately be successful in developing and commercializing 
appropriate diagnostics to pair with any of our product candidates that receive marketing approval. We rely on third parties for the automation, 
characterization and validation, of our bioanalytical assays, companion diagnostics and the manufacture of critical reagents.
Companion diagnostics are subject to regulation by the FDA and similar regulatory authorities outside the U.S. as medical devices and require 
regulatory clearance or approval prior to commercialization. In the U.S., companion diagnostics are cleared or approved through FDA’s 510(k) premarket 
notification or premarket approval, or PMA, process. Changes in marketing approval policies during the development period, changes in or the enactment of 
additional statutes or regulations, or changes in regulatory review for each submitted 510(k) premarket notification, PMA or equivalent application types in 
jurisdictions outside the U.S., may cause delays in the approval, clearance or rejection of an application. Given our limited experience in developing and 
commercializing diagnostics, we expect to rely in part or in whole on third parties for companion diagnostic design and commercialization. We and our 
collaborators may encounter difficulties in developing and obtaining approval or clearance for the companion diagnostics, including issues relating to 
selectivity/specificity, analytical validation, reproducibility, or clinical validation. Any delay or failure by us or our collaborators to develop or obtain 
regulatory approval of the companion diagnostics could delay or prevent approval of our product candidates.

 
42
Risks Related to our Reliance on Third Parties 
We rely on third parties to conduct our nonclinical and clinical studies and perform other tasks for us. If these third parties do not successfully carry out 
their contractual duties, meet expected deadlines, or comply with regulatory requirements, we may be exposed to sub-optimal quality and reputational 
harm, we may not be able to obtain regulatory approval for or commercialize our product candidates, and our business could be substantially harmed. 
We have relied upon and plan to continue to rely upon third parties, including CROs, collaborative partners, and independent investigators to analyze, 
collect, monitor, and manage data for our ongoing nonclinical and clinical programs. We rely on third parties for execution of our nonclinical and clinical 
studies, and for estimates regarding costs and efforts completed, and we control only certain aspects of their activities. We and our CROs and other vendors 
and partners are required to comply with GMP, GCP, and GLP, which are regulations and guidelines enforced by the FDA, the Competent Authorities of the 
Member States of the European Economic Area, and comparable foreign regulatory authorities for all of our product candidates in development. Regulatory 
authorities enforce these regulations through periodic inspections of study sponsors, principal investigators, study sites, and other contractors. If we or any 
of our CROs or other vendors and partners, including the sites at which clinical studies are conducted, fail to comply with applicable regulations, the data 
generated in our nonclinical and clinical studies may be deemed unreliable and the FDA, EMA, or comparable foreign regulatory authorities may deny 
approval and/or require us to perform additional nonclinical and clinical studies before approving our marketing applications, which would delay the 
approval process. We cannot make assurances that upon inspection by a given regulatory authority, such regulatory authority will determine that any of our 
clinical studies comply with GCP regulations or that nonclinical studies comply with GLP regulations. In addition, our clinical studies must be conducted with 
products produced under GMP regulations. If the regulatory authorities determine that we have failed to comply with GLP, GMP, or GCP regulations, they 
may deny approval of our product candidates and/or we may be required to repeat clinical or nonclinical studies, which would delay the regulatory approval 
process. 
Our CROs and other vendors and partners are not our employees, and we cannot control whether or not they devote sufficient time and resources to 
our on-going nonclinical and clinical programs, except for the limited remedies available to us under our agreements with such third parties. If our vendors 
and partners do not successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced, or if the quality or 
accuracy of the data they obtain is compromised due to the failure to adhere to our protocols, regulatory requirements, or for other reasons, our clinical 
studies may be extended, delayed, or terminated, and we may not be able to obtain regulatory approval for or successfully commercialize our product 
candidates. CROs and other vendors and partners have also generated higher costs than anticipated as a result of changes in scope of work or otherwise. As 
a result, the commercial prospects for our product candidates could be harmed, our costs could increase, and our ability to generate revenue could be 
delayed. 
If any of our relationships with these third parties terminate, we may not be able to enter into arrangements with alternative vendors or do so on 
commercially reasonable terms. Switching or adding additional vendors involves additional cost and requires management time and focus. In addition, there 
is a natural transition period when a new vendor commences work. As a result, delays may occur, which can materially impact our ability to meet our desired 
clinical development timelines. Our efforts to manage our relationships with our vendors and partners can provide no assurance that we will not encounter 
similar challenges or delays in the future or that these delays or challenges will not have a material adverse impact on our business, financial condition, and 
business prospects. 
We also rely on third parties in other ways, including efforts to support patient diagnosis and identify patients, to assist our finance and legal 
departments, and to provide other resources for our business. Use of these third parties could expose us to sub-optimal quality, missed deadlines, and non-
compliance with applicable laws, all of which could result in reputational harm to us and negatively affect our business.

 
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We are dependent on KKC for the commercialization of Crysvita in our markets, including the U.S. and Canada, and for our supply of Crysvita in our 
markets. Failure by KKC to commercialize Crysvita in those markets, or to supply Crysvita to us, could result in a material adverse effect on our business 
and operating results. 
Pursuant to the terms of our collaboration and license agreement with KKC, or the collaboration agreement, commercialization responsibilities for 
Crysvita in the U.S. and Canada transitioned from us to KKC in April 2023. KKC also has the sole right to commercialize Crysvita in Europe and, at certain 
specified times, in Turkey, subject to certain rights retained. A substantial portion of our total revenue has been based on revenue from Crysvita, including 
royalty revenue we receive from KKC for sales of the product in the U.S. and Canada. The commercial success of Crysvita in territories in which KKC owns 
commercialization responsibilities, such as in the U.S. and Canada depends on, among other things, the efforts and allocation of resources of KKC in those 
territories, which we do not control. KKC has no obligation under the collaboration agreement to use diligent efforts to commercialize Crysvita in those 
territories. Our partnership with KKC may not be successful, and we may not realize the expected benefits from such partnership, due to a number of 
important factors, including but not limited to the following: 
•
KKC may change the focus of its commercialization efforts or pursue higher priority programs; 
•
KKC may make decisions regarding the indications for our product candidates in countries where it has the sole right to commercialize the 
product candidates that limit commercialization efforts in those countries or in countries where we have the right to commercialize our product 
candidates; 
•
KKC may make decisions regarding market access and pricing in countries where it has the sole right to commercialize our product candidates 
which can negatively impact our commercialization efforts in countries where we have the right to commercialize our product candidates;
•
KKC may fail to manufacture or supply sufficient drug product of Crysvita in compliance with applicable laws and regulations or otherwise for our 
development and clinical use or commercial use, which could result in program delays or lost revenue;
•
KKC may elect to develop and commercialize Crysvita indications with a larger market than XLH and at a lower price, thereby reducing the profit 
margin on sales of Crysvita for any orphan indications, including XLH; 
•
if KKC were to breach or terminate the agreement with us, we would no longer have any rights to develop or commercialize Crysvita or such 
rights would be limited to non-terminated countries; 
•
KKC may terminate its agreement with us, adversely affecting our potential revenue from licensed products; and 
•
the timing and amounts of expense reimbursement that we may receive are uncertain, and the total expenses for which we are obligated to 
reimburse KKC may be greater than anticipated. 
We rely on third parties to manufacture our products and our product candidates and we are subject to a multitude of manufacturing risks, any of which 
could substantially increase our costs and limit the supply of our products and product candidates. 
As we currently lack the resources and the full capability to manufacture all of our products and product candidates on a clinical or commercial scale, 
we rely on third parties to manufacture, store and distribute our products and product candidates. Although we oversee the contract manufacturers, we 
cannot control the manufacturing process of, and are substantially dependent on, our contract manufacturing partners for compliance with the regulatory 
requirements. See the risk factor above entitled “- Even if we obtain regulatory approval for our product candidates, our products remain subject to 
regulatory scrutiny”. Further, we depend on our manufacturers to purchase from third-party suppliers the materials necessary to produce our products and 
product candidates. There are a limited number of suppliers for raw materials that we use to manufacture our drugs, placebos, or active controls, and there 
may be a need to identify alternate suppliers to prevent or mitigate a possible disruption of the manufacture of the materials necessary to produce our 
products and product candidates for our clinical studies, and, if approved, ultimately for commercial sale. We also do not have any control over the process 
or timing of the acquisition of these raw materials by our manufacturers. We may also experience interruptions in supply of product if the product or raw 
material components fail to meet our quality control standards or the quality control standards of our suppliers. 
Further, manufacturers that produce our products and product candidates may not have experience producing our products and product candidates 
at commercial levels and may not produce our products and product candidates at the cost, quality, quantities, locations, and timing needed to support 
profitable commercialization. We have not yet secured manufacturing capabilities for commercial quantities of all of our product candidates and may be 
unable to negotiate binding agreements with manufacturers to support our commercialization activities on commercially reasonable terms. Even if our third-
party product manufacturers develop acceptable manufacturing processes that provide the necessary quantities of our products and product candidates in a 
compliant and timely manner, the cost to us for the supply of our products and product candidates manufactured by 

 
44
such third parties may be high and could limit our profitability. For instance, KKC is our sole supplier of commercial quantities of Crysvita. The supply price to 
us for commercial sales of Crysvita in Latin America is 30% of net sales, which is higher than the typical cost of sales for companies focused on rare diseases.
The process of manufacturing our products and product candidates is complex, highly regulated, and subject to several risks, including but not limited 
to those listed below. 
•
The process of manufacturing our products and product candidates is extremely susceptible to product loss due to contamination, equipment 
failure or improper installation or operation of equipment, or vendor or operator error. Even minor deviations from normal manufacturing 
processes for our products and any of our product candidates could result in reduced production yields, product defects, and other supply 
disruptions. If microbial, viral, or other contaminations are discovered in our products and product candidates or in the manufacturing facilities 
in which our products and product candidates are made, such manufacturing facilities may need to be closed for an extended period of time to 
investigate and remedy the contamination.
•
The manufacturing facilities in which our products and product candidates are made could be adversely affected by equipment failures, labor 
shortages, raw material shortages, natural disasters, power failures, actual or threatened public health emergencies, and numerous other 
factors. 
Any adverse developments affecting manufacturing operations for our products and product candidates may result in shipment delays, inventory 
shortages, lot failures, withdrawals or recalls, or other interruptions in the supply of our products and product candidates. Due to their stage of 
development, small volume requirements, and infrequency of batch production runs, we carry limited amounts of safety stock for our products and product 
candidates. We have, and may in the future, be required to take inventory write-offs and incur other charges and expenses for products and product 
candidates that fail to meet specifications, undertake costly remediation efforts, or seek more costly manufacturing alternatives.
The drug substance and drug product for our products and most of our product candidates are currently acquired from single-source suppliers. The loss of 
these suppliers, or their failure to supply us with the necessary drug substance or drug product, could materially and adversely affect our business.
We acquire most of the drug substances and drug products for our products and product candidates from single sources. If any single source supplier 
breaches an agreement with us, or terminates the agreement in response to an alleged breach by us, ceases operations, is acquired, enters into exclusive 
arrangements with a competitor or otherwise becomes unable or unwilling to fulfill its supply obligations, we would not be able to manufacture and 
distribute the product or product candidate until a qualified alternative supplier is identified, which could significantly impair our ability to commercialize 
such product or delay the development of such product candidate. For example, the drug substance and drug product for Crysvita and Evkeeza are made, 
respectively, by KKC pursuant to a license and collaboration agreement and supply agreements and Regeneron pursuant to a supply agreement. Further, 
single source suppliers are also used for our gene therapy programs and for Dojolvi, for which we are in the process of qualifying our alternative supplier. We 
cannot provide assurances that qualifying alternate sources, if available at all, for any of our drug substances and drug products, and establishing 
relationships with such sources would not result in significant expense, supply disruptions or delay in the commercialization of our products or the 
development of our product candidates. Additionally, we may not be able to enter into supply arrangements with an alternative supplier on commercially 
reasonable terms or at all. The terms of any new agreement may also be less favorable or more costly than the terms we have with our current supplier. A 
delay in the commercialization of our products or the development of our product candidates or having to enter into a new agreement with a different third-
party on less favorable terms than we have with our current suppliers could have a material adverse impact upon on our business. Furthermore, geopolitical 
tensions with China including the Congressional legislative proposal, titled the BIOSECURE Act, which would, among other things, prohibit U.S. federal 
funding in connection with biotechnology equipment or services produced or provided by Chinese biotechnology companies, and the recent requests by 
certain Congressional leaders that WuXi AppTech Co. and its affiliates be added to certain U.S. Government restricted entity lists, could lead to our 
competitors and other companies moving to suppliers outside of China, including to our current suppliers. Significant increases in business at our single 
source suppliers resulting from such activities could adversely limit capacity at such suppliers to manufacture our products or result in price increases, 
interruptions or delays of our products.

 
45
The actions of distributors and specialty pharmacies could affect our ability to sell or market products profitably. Fluctuations in buying or distribution 
patterns by such distributors and specialty pharmacies could adversely affect our revenues, financial condition, or results of operations. 
We rely on commercial distributors and specialty pharmacies for a considerable portion of our product sales and such sales are concentrated within a 
small number of distributors and specialty pharmacies. The financial failure of any of these parties could adversely affect our revenues, financial condition or 
results of operations. Our revenues, financial condition or results of operations may also be affected by fluctuations in buying or distribution patterns of such 
distributors and specialty pharmacies. These fluctuations may result from seasonality, pricing, wholesaler inventory objectives, or other factors. 
Risks Related to Commercialization of Our Products and Product Candidates 
If the market opportunities for our products and product candidates are smaller than we believe they are, our revenue may be adversely affected, and our 
business may suffer. Because the target patient populations of our products and product candidates are small, and the addressable patient population 
potentially even smaller, we must be able to successfully identify patients and acquire a significant market share to achieve profitability and growth. 
We focus our research and product development on treatments for rare and ultrarare genetic diseases. Given the small number of patients who have 
the diseases that we are targeting, it is critical to our ability to grow and become profitable that we continue to successfully identify patients with these rare 
and ultrarare genetic diseases. Some of our current products or clinical programs may also be most appropriate for patients with more severe forms of their 
disease. For instance, while adults make up the majority of the XLH patients, they often have less severe disease that may reduce the penetration of Crysvita 
in the adult population relative to the pediatric population. Given the overall rarity of the diseases we target, it is difficult to project the prevalence of the 
more severe forms, or the other subsets of patients that may be most suitable to address with our products and product candidates, which may further limit 
the addressable patient population to a small subset. Our projections of both the number of people who have these diseases, as well as the subset of people 
with these diseases who have the potential to benefit from treatment with our products and product candidates, are based on our beliefs and estimates. 
These estimates have been derived from a variety of sources, including the scientific literature, surveys of clinics, patient foundations, or market research, 
and may prove to be incorrect. Further, new studies may change the estimated incidence or prevalence of these diseases. The number of patients may turn 
out to be lower than expected. The effort to identify patients with diseases we seek to treat is in early stages, and we cannot accurately predict the number 
of patients for whom treatment might be possible. Additionally, the potentially addressable patient population for each of our products and product 
candidates may be limited or may not be amenable to treatment with our products and product candidates, and new patients may become increasingly 
difficult to identify or access. Further, even if we obtain significant market share for our products and product candidates, because the potential target 
populations are very small, we may never become or remain profitable nor generate sufficient revenue growth to sustain our business.
We face intense competition and rapid technological change, including the use of artificial intelligence, or AI, and the possibility that our competitors may 
develop therapies that are similar, more advanced, or more effective than ours, which may adversely affect our financial condition and our ability to 
successfully commercialize our product candidates. 
The biotechnology and pharmaceutical industries are intensely competitive and subject to rapid and significant technological change. We are 
currently aware of various existing treatments that may compete with our products and product candidates. See “Item 1. Business – Competition” above. 

 
46
We have competitors both in the U.S. and internationally, including major multinational pharmaceutical companies, specialty pharmaceutical 
companies, biotechnology companies, startups, academic research institutions, government agencies, and public and private research institutions. Many of 
our competitors have substantially greater financial, technical, and other resources, such as larger research and development staff and experienced 
marketing and manufacturing organizations. Additional mergers and acquisitions in the biotechnology and pharmaceutical industries can often result in even 
more resources being concentrated in our competitors. As a result, these companies may obtain regulatory approval more rapidly than we are able to and 
may be more effective in selling and marketing their products as well. Smaller or early-stage companies may also prove to be significant competitors, 
particularly through collaborative arrangements with large, established companies. Competition may increase further as a result of advances in the 
commercial applicability of technologies and greater availability of capital for investment in these industries. Our competitors may succeed in developing, 
acquiring, or licensing on an exclusive basis, products that are more effective or less costly than any product candidate that we may develop, or achieve 
earlier patent protection, regulatory approval, product commercialization, and market penetration than we do. Additionally, technologies developed by our 
competitors may render our potential products and product candidates uneconomical or obsolete, and we may not be successful in marketing our products 
and product candidates against competitors. Moreover, we also face increased competition from other companies that are using AI, some of whom may be 
able to more quickly and effectively identify and develop novel drug candidates compared to us and our business partners, which could impair our ability to 
compete effectively and have a material adverse effect on our business, results of operations, or financial condition.
We may not be able to effectively manage the expansion of our organization, including building an integrated commercial organization. If we are unable 
to expand our existing commercial infrastructure or enter into agreements with third parties to market and sell our products and product candidates, as 
needed, we may be unable to increase our revenue. 
We expect to need additional managerial, operational, marketing, financial, legal, and other resources to support our development and 
commercialization plans and strategies. In order to successfully commercialize our products as well as any additional products that may result from our 
development programs or that we acquire or license from third parties, we expect to expand our commercial team in the United States as well as in Europe, 
Latin America and the Asia-Pacific region. This infrastructure consists of both office-based as well as field teams with technical expertise, and is expected to 
be expanded as we approach the potential approval dates of additional products that result from our development programs. Our management may need to 
divert a disproportionate amount of its attention away from our day-to-day activities and devote a substantial amount of time to managing these growth 
activities. We may not be able to effectively manage the expansion of our operations, which may result in weaknesses in our infrastructure, operational 
mistakes, loss of business opportunities, loss of employees, and reduced productivity among remaining employees. Our expected growth could require 
significant capital expenditures and may divert financial resources from other projects, such as the development of additional product candidates. If our 
management is unable to effectively manage our growth, our expenses may increase more than expected, our ability to generate and/or grow revenue could 
be reduced, and we may not be able to implement our business strategy. Our future financial performance and our ability to commercialize product 
candidates and compete effectively will depend, in part, on our ability to effectively manage any future growth. 
We, as a company, have limited, experience selling and marketing our product and only some of our employees have prior experience promoting 
other similar products while employed at other companies. As we increase the number and range of our commercialized products, we may experience 
additional complexities in our sales process and strategy and may encounter difficulties in allocating sufficient resources to sales and marketing of certain 
products. Further, as we launch additional products or as demand for our products change, our initial estimate of the size of the required field force may be 
materially more or less than the size of the field force actually required to effectively commercialize our product candidates. As such, we may be required to 
hire larger teams to adequately support the commercialization of our products and product candidates or we may incur excess costs in an effort to optimize 
the hiring of commercial personnel. With respect to certain geographical markets, we may enter into collaborations with other entities to utilize their local 
marketing and distribution capabilities, but we may be unable to enter into such agreements on favorable terms, if at all. If our future collaborators do not 
commit sufficient resources to commercialize our future products, if any, and we are unable to develop the necessary marketing capabilities on our own, we 
will be unable to generate sufficient product sales to sustain our business. We face competition from companies that currently have extensive and well-
funded marketing and sales operations. Without a large internal team or the support of a third party to perform key commercial functions, we may be unable 
to compete successfully against these more established companies.

 
47
The commercial success of any current or future product will depend upon the degree of market acceptance by physicians, patients, third-party payors, 
and others in the medical community. 
Even with the requisite approvals from the FDA and comparable foreign regulatory authorities, the commercial success of our current and future 
products will depend in part on the medical community, patients, and payors accepting our current and future products as medically useful, cost-effective, 
and safe. Any product that we bring to the market may not gain market acceptance by physicians, patients, payors, and others in the medical community. 
The degree of market acceptance of any of our current and future products will depend on a number of factors, including: 
•
the efficacy of the product as demonstrated in clinical studies and potential advantages over competing treatments; 
•
the prevalence and severity of any side effects, including any limitations or warnings contained in a product’s approved labeling; 
•
the clinical indications for which approval is granted; 
•
relative convenience and ease of administration; 
•
the cost of treatment, particularly in relation to competing treatments; 
•
the willingness of the target patient population to try new therapies and of physicians to prescribe these therapies; 
•
the effectiveness of our field forces and marketing efforts;
•
the strength of marketing and distribution support and timing of market introduction of competitive products; 
•
publicity concerning our products or competing products and treatments; and 
•
sufficient third-party insurance coverage and reimbursement. 
Even if a potential product displays a favorable efficacy and safety profile in nonclinical and clinical studies, market acceptance of the product will not 
be fully known until after it is launched. Our efforts to educate the medical community and payors on the benefits of the product candidates require 
significant resources and may never be successful. If our current and future products fail to achieve an adequate level of acceptance by physicians, patients, 
payors, and others in the medical community, we will not be able to generate sufficient revenue to become or remain profitable.
The insurance coverage and reimbursement status of newly approved products is uncertain. Failure to obtain or maintain adequate coverage and 
reimbursement for new or current products could limit our ability to market those products and decrease our ability to generate revenue. 
Our target patient populations are small, and accordingly the pricing, coverage, and reimbursement of our products and product candidates, if 
approved, must be adequate to support our commercial infrastructure. Our per-patient prices must be sufficient to recover our development and 
manufacturing costs and potentially achieve profitability. We expect the cost of a single administration of gene therapy products, such as those we are 
developing, to be substantial, when and if they achieve regulatory approval. Accordingly, the availability and adequacy of coverage and reimbursement by 
governmental and private payors are essential for most patients to afford expensive treatments such as ours, assuming approval. Sales of our products and 
product candidates, if approved, will depend substantially, both domestically and abroad, on the extent to which their costs will be paid for by health 
maintenance, managed care, pharmacy benefit, and similar healthcare management organizations, or reimbursed by government authorities, private health 
insurers, and other payors. If coverage and reimbursement are not available, are available only to limited levels, or are not available on a timely basis, we 
may not be able to successfully commercialize our products and product candidates, if approved. For example, deteriorating economic conditions and 
political instability in certain Latin American countries and in Turkey continue to cause us to experience significant delays in receiving approval for 
reimbursement for our products and consequently impact our product commercialization timelines in such regions. Even if coverage is provided, the 
approved reimbursement amount may not be high enough to allow us to establish or maintain pricing sufficient to sustain our overall enterprise. In addition, 
we do not know the reimbursement rates until we are ready to market the product and we actually negotiate the rates.
There is significant uncertainty related to the insurance coverage and reimbursement of newly approved products. In the U.S., the Centers for 
Medicare & Medicaid Services, or CMS, an agency within the U.S. Department of Health and Human Services, decides whether and to what extent a new 
drug will be covered and reimbursed under Medicare. Private payors tend to follow the coverage reimbursement policies established by CMS to a substantial 
degree. It is difficult to predict what CMS or private payors will decide with respect to reimbursement for products such as ours, especially our gene therapy 
product candidates as there is a limited body of established practices and precedents for gene therapy products. 

 
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Outside the U.S., international operations are generally subject to extensive governmental price controls and other market regulations, and we 
believe the increasing emphasis on cost-containment initiatives in Europe, Canada, and other countries will put pressure on the pricing and usage of our 
products and product candidates. In many countries, the prices of medical products are subject to varying price control mechanisms as part of national 
health systems. Other countries allow companies to fix their own prices for medicinal products, but monitor and control company profits. Additional foreign 
price controls or other changes in pricing regulation could restrict the amount that we are able to charge for our product candidates. Accordingly, in foreign 
markets, the reimbursement for our products may be reduced compared with the U.S. and may be insufficient to generate commercially reasonable revenue 
and profits. The timing to complete the negotiation process in each country is highly uncertain, and in some countries outside of the U.S., we expect the 
process to exceed several months. Even if a price can be negotiated, countries frequently request or require reductions to the price and other concessions 
over time, including retrospective “clawback” price reductions. Additionally, member states of the EU have regularly imposed new or additional cost 
containment measures for pharmaceuticals such as volume discounts, cost caps, clawbacks and free products for a portion of the expected therapy period. 
For example, in France, we estimate clawback reserves on Dojolvi and Evkeeza based on current regulations, our estimate of pricing on approval of Dojolvi 
and Evkeeza and other factors. However, if pricing is approved at levels lower than estimated, if at all, or if there are further changes in the regulatory 
framework, we may be required to pay back amounts higher than clawback reserves and reverse revenue that has been previously recorded.
Moreover, increasing efforts by governmental and third-party payors in the U.S. and abroad to cap or reduce healthcare costs may cause such 
organizations to limit both coverage and the level of reimbursement for new products and, as a result, they may not cover or provide adequate payment for 
our products and product candidates. We expect to experience pricing pressures in connection with the sale of any of our products and product candidates 
due to the trend toward managed healthcare, the increasing influence of health maintenance organizations, additional legislative changes, including the 
impact from the Inflation Reduction Act of 2022, and statements by elected officials. For example, proposals have been discussed to tie U.S. drug prices to 
the cost in other countries, several states in the U.S. have introduced legislation to require pharmaceutical companies to disclose their costs to justify the 
prices of their products. Drug pricing is also expected to remain a focus for the current Presidential Administration and Congress. The downward pressure on 
healthcare costs in general, and with respect to prescription drugs, surgical procedures, and other treatments in particular, has become very intense. As a 
result, increasingly high barriers are being erected to the entry of new products.
Risks Related to Our Intellectual Property 
If we are unable to obtain and maintain effective patent rights for our products, product candidates, or any future product candidates, we may not be 
able to compete effectively in our markets. 
We rely upon a combination of patents, trade secret protection, and confidentiality agreements to protect the intellectual property related to our 
technologies, our products, and our product candidates. Our success depends in large part on our and our licensors’ ability to obtain and maintain patent and 
other intellectual property protection in the U.S. and in other countries with respect to our proprietary technologies, our products, and our product 
candidates. 
We have sought to protect our proprietary position by filing patent applications in the U.S. and abroad related to our novel technologies, products 
and product candidates that are important to our business. This process is expensive and time consuming, and we may not be able to file and prosecute all 
necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify patentable aspects of our 
research and development output before it is too late to obtain patent protection. 
The patent position of biotechnology and pharmaceutical companies generally is highly uncertain and involves complex legal and factual questions for 
which legal principles remain unsettled. The patent applications that we own or in-license may fail to result in issued patents with claims that cover our 
products or product candidates in the U.S. or in foreign countries. There is no assurance that all potentially relevant prior art relating to our patents and 
patent applications has been found, which can prevent a patent from issuing from a pending patent application or provide the basis for third parties to 
challenge the validity of an issued patent. Third parties may challenge the validity, enforceability, or scope of any issued patents, which may result in such 
patents being narrowed, found unenforceable, or invalidated. Furthermore, even if the patents and patent applications we own or in-license are 
unchallenged, they may not adequately protect our intellectual property, provide exclusivity for our products or product candidates, or prevent others from 
designing around our claims. Any of these outcomes could impair our ability to prevent competition from third parties. 

 
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We, independently or together with our licensors, have filed several patent applications covering various aspects of our products or product 
candidates. We cannot offer any assurances about which, if any, patent applications will issue, the breadth of any issued patent, or whether any issued 
patents will be found invalid and unenforceable or will be threatened by third parties. Any successful opposition to these patents could impair the exclusivity 
position of our products or deprive us of rights necessary for the successful commercialization of any product candidates that are approved. Further, if we 
encounter delays in regulatory approvals, the period of time during which we could market a product candidate under patent protection could be reduced. 
Our current patents or applications covering methods of use and certain compositions of matter do not provide complete patent protection for our 
products and product candidates in all territories. For example, there are no issued patents covering the Crysvita composition of matter in Latin America, 
where we have rights to commercialize this product. Therefore, a competitor could develop the same antibody or a similar antibody as well as other 
approaches that target FGF23 for potential commercialization in Latin America, subject to any intellectual property rights or regulatory exclusivities awarded 
to us. If we cannot obtain and maintain effective patent rights for our products or product candidates, we may not be able to compete effectively and our 
business and results of operations would be harmed.
We may not have sufficient patent terms to effectively protect our products and business. 
Patents have a limited lifespan. In the U.S., the natural expiration of a patent is generally 20 years from its earliest non-provisional filing date. 
Although various extensions may be available, the life of a patent, and the protection it affords, is limited. Even if patents covering our products or product 
candidates are obtained, once the patent life has expired for a product, we may be open to competition from generic or biosimilar medications.
Patent term extensions under the Hatch-Waxman Act in the U.S. and under supplementary protection certificates in Europe may not be available to 
extend the patent exclusivity term for our products and product candidates, and we cannot provide any assurances that any such patent term extension will 
be obtained and, if so, for how long. Furthermore, we may not receive an extension if we fail to apply within applicable deadlines, fail to apply prior to 
expiration of relevant patents, or otherwise fail to satisfy applicable requirements. Moreover, the length of the extension could be less than we request. If 
we do not have sufficient patent terms or regulatory exclusivity to protect our products, our business and results of operations may be adversely affected. 
Patent law and rule changes could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or 
defense of our issued patents. 
Changes in either the patent laws or interpretation of the patent laws in the U.S. and other countries may diminish the value of our patents or narrow 
the scope of our patent protection. The laws of foreign countries may not protect our rights to the same extent as the laws of the U.S. Publications of 
discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the U.S. and other jurisdictions are typically not 
published until 18 months after filing, or in some cases not at all. We therefore cannot be certain that we or our licensors were the first to make the 
inventions claimed in our owned and in-licensed patents or pending applications, or that we or our licensor were the first to file for patent protection of such 
inventions. 
In 2011, the Leahy-Smith America Invents Act, or the Leahy-Smith Act, was signed into law and introduced significant changes to the prosecution of 
U.S. patent applications and to the procedures for challenging U.S. patents. The effects of these changes remain unclear owing to the evolving nature of the 
law and the lengthy timelines associated with court system review and interpretation. Consequently, the Leahy-Smith Act and its implementation could 
increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents, all of 
which could have a material adverse effect on our business and financial condition.
Outside the U.S., there have been changes to patent laws in certain jurisdictions that could impair our ability to obtain, maintain, or enforce our 
patents in those territories. For instance, Europe’s new Unitary Patent system and Unified Patent Court, or the UPC, may present uncertainties for our ability 
to protect and enforce our patent rights against competitors in Europe. In 2012, as part of the European Patent Package, or the EU Patent Package, 
regulations were passed with the goal of providing a single pan-European Unitary Patent system and a new UPC, for litigation involving European patents. 
Implementation of the EU Patent Package occurred in June 2023. Under the UPC, all European patents, including those issued prior to ratification of the 
European Patent Package, will by default automatically fall under the jurisdiction of the UPC. The UPC will provide our competitors with a new forum in 
which to seek central revocation of our European patents and allow for the possibility of a competitor to obtain pan-European injunctions. It will be several 
years before we will understand the scope of patent rights that will be recognized and the strength of patent remedies that will be provided by the UPC. 
Under the EU Patent Package, we will have the right to opt our patents out of the UPC over the first seven years of the court’s existence, but doing so may 
preclude us from realizing the benefits of the new unified court.

 
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If we are unable to maintain effective proprietary rights for our products, product candidates, or any future product candidates, we may not be able to 
compete effectively in our markets. 
In addition to the protection afforded by patents, we rely on trade secret protection and confidentiality agreements to protect proprietary know-how 
that is not patentable or that we elect not to patent, processes for which patents are difficult to enforce and any other elements of our products or product 
candidate discovery and development processes that involve proprietary know-how, information, or technology that is not covered by patents. However, 
trade secrets can be difficult to protect. The confidentiality agreements entered into with our employees, consultants, scientific advisors, contractors and 
other third parties that we rely on in connection with the development, manufacture and commercialization of our products may not be sufficient to protect 
our proprietary technology and processes, which increase the risk that such trade secrets may become known by our competitors or may be inadvertently 
incorporated into the technology of others.
The physical security of our premises and physical and electronic security of our information technology systems may not preserve the integrity and 
confidentiality of our data and trade secrets. These individuals, organizations and systems, agreements or security measures may be breached, and we may 
not have adequate remedies for any breach. In addition, our trade secrets may otherwise become known or be independently discovered by competitors. 
The assignment agreements we enter into with our employees and consultants to assign their inventions to us, and the confidentiality agreements we 
enter into with our employees, consultants, advisors, and any third parties who have access to our proprietary know-how, information, or technology may 
not have been duly executed and we cannot assure that our trade secrets and other confidential proprietary information will not be disclosed or that 
competitors will not otherwise gain access to our trade secrets or independently develop substantially equivalent information and techniques. 
Misappropriation or unauthorized disclosure of our trade secrets could impair our competitive position and may have a material adverse effect on our 
business. Additionally, if the steps taken to maintain our trade secrets are deemed inadequate, we may have insufficient recourse against third parties for 
misappropriating the trade secret. 
Claims of intellectual property infringement may prevent or delay our development and commercialization efforts.
Our commercial success depends in part on our avoiding infringement of the patents and proprietary rights of others. There have been many lawsuits 
and other proceedings involving patent and other intellectual property rights in the biotechnology and pharmaceutical industries, including patent 
infringement lawsuits, interferences, inter partes reviews, post grant reviews, oppositions, and reexamination proceedings before the USPTO and 
corresponding foreign patent offices. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by other parties, exist in 
the fields in which we are developing product candidates. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk 
increases that our products or product candidates may be subject to claims of infringement of the patent rights of these other parties. 
Other parties may assert that we are employing their proprietary technology without authorization. There may be patents or patent applications with 
claims to materials, formulations, methods of manufacture, or methods for treatment relevant to the use or manufacture of our products or product 
candidates. We have conducted freedom to operate analyses with respect only to our products and certain of our product candidates, and therefore we do 
not know whether there are any patents of other parties that would impair our ability to commercialize all of our product candidates. We also cannot 
guarantee that any of our analyses are complete and thorough, nor can we be sure that we have identified each and every patent and pending application in 
the U.S. and abroad that covers technology relevant or necessary to the commercialization of our products or product candidates. Because patent 
applications can take many years to issue, there may be currently pending patent applications that may later result in issued patents that are relevant to our 
products or product candidates. 
We are aware of certain U.S. and foreign patents owned by third parties that a court might construe to be valid and relevant to one or more of our 
gene therapy product candidates, certain methods that may be used in their manufacture or delivery, or certain formulations comprising one or more of our 
gene therapy candidates. Regarding our anti-sclerostin antibody product candidate, setrusumab, we are aware of litigation involving patents owned by a 
third-party, OssiFi-Mab LLC, or OMab, relating to methods of using sclerostin antagonists in combination with antiresorptive drugs to increase bone growth, 
bone formation, and/or bone density. Specifically, in the U.S., OMab has asserted certain patents expiring in 2027 or 2028 against Amgen based on Amgen’s 
commercialization of an anti-sclerostin antibody, Evenity®, for the treatment of osteoporosis in postmenopausal women at high risk for fracture; Amgen 
denies infringement and asserts the OMab patents are invalid. In Europe, OMab was granted two patents with related subject matter; the first patent has 
been revoked while the second has been opposed by Amgen, UCB, and two anonymous parties. There is a risk that one or more third parties may choose to 
engage in litigation with us to enforce or to otherwise assert their patent rights against us. Even if we believe such claims are without merit, a court of 
competent jurisdiction could hold that one or more of these patents is valid, enforceable, and infringed, in which case the owners of any such patents may be 
able to block our ability to commercialize a product candidate unless we obtain a license under the applicable patents, or until such patents expire. However, 
such a license may not be available on commercially reasonable terms or at all.

 
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Parties making claims against us may obtain injunctive or other equitable relief, which could effectively block our ability to continue commercialization 
of our products, or block our ability to develop and commercialize one or more of our product candidates. Defense of these claims, regardless of their merit, 
would involve substantial litigation expense and would be a substantial diversion of employee resources from our business. In the event of a successful claim 
of infringement against us, we may have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, pay royalties, 
redesign our infringing products, or obtain one or more licenses from third parties, which may be impossible or require substantial time and monetary 
expenditure.
We may not be successful in obtaining or maintaining necessary rights to our product candidates through acquisitions and in-licenses. 
Because our programs may require the use of proprietary rights held by third parties, the growth of our business will likely depend in part on our 
ability to acquire, in-license, or use these proprietary rights. We may be unable to acquire or in-license any compositions, methods of use, processes, or other 
third-party intellectual property rights from third parties that we identify as necessary for our product candidates. The licensing and acquisition of third-party 
intellectual property rights is a competitive area, and a number of more established companies are also pursuing strategies to license or acquire third-party 
intellectual property rights that we may consider attractive. These established companies may have a competitive advantage over us due to their size, cash 
resources, and greater clinical development and commercialization capabilities. In addition, companies that perceive us to be a competitor may be unwilling 
to assign or license rights to us. We also may be unable to license or acquire third-party intellectual property rights on terms that would allow us to make an 
appropriate return on our investment. 
We sometimes collaborate with U.S. and foreign academic institutions to accelerate our preclinical research or development under written 
agreements with these institutions. Typically, these institutions provide us an option to negotiate a license to any of the institution’s rights in technology 
resulting from the collaboration. Regardless of such option, we may be unable to negotiate a license within the specified timeframe or under terms that are 
acceptable to us. If we are unable to do so, the institution may offer the intellectual property rights to other parties, potentially blocking our ability to pursue 
our program. 
If we are unable to successfully obtain rights to required third-party intellectual property rights or maintain the existing intellectual property rights we 
have, we may have to abandon development of the corresponding program. 
We may face competition from biosimilars, which may have a material adverse impact on the future commercial prospects of our biological products and 
product candidates.
Even if we are successful in achieving regulatory approval to commercialize a product candidate faster than our competitors, we may face competition 
from biosimilars with respect to our biological products (Crysvita, Mepsevii and Evkeeza) and our biological product candidates. In the U.S., the Biologics 
Price Competition and Innovation Act of 2009, or BPCI Act, was included in the Affordable Care Act and created an abbreviated approval pathway for 
biological products that are demonstrated to be “highly similar,” or biosimilar, to or “interchangeable” with an FDA-approved biological product. The BPCI 
Act prohibits the FDA from approving a biosimilar or interchangeable product that references a brand biological product until 12 years after the licensure of 
the reference product, but permits submission of an application for a biosimilar or interchangeable product to the FDA four years after the reference product 
was first licensed. The BPCI Act does not prevent another company from developing a product that is highly similar to the innovative product, generating its 
own data, and seeking approval. The law is complex and is still being interpreted and implemented by the FDA. Moreover, aspects of the law are still being 
evaluated and interpreted by courts. As a result, its ultimate impact, implementation and meaning are subject to uncertainty. Modification of the BPCI Act, or 
changes to the interpretation or implementation of the BPCI Act, could have a material adverse effect on the future commercial prospects for our biological 
products and product candidates. 
In Europe, the European Commission has granted marketing authorizations for several biosimilars pursuant to a set of general and product class-
specific guidelines for biosimilar approvals issued over the past few years. In Europe, a competitor may reference data supporting approval of an innovative 
biological product, but will not be able to get on the market until 10 years after the time of approval of the innovative product. This 10-year marketing 
exclusivity period will be extended to 11 years if, during the first eight of those 10 years, the marketing authorization holder obtains an approval for one or 
more new therapeutic indications that bring significant clinical benefits compared with existing therapies. In addition, companies may be developing 
biosimilars in other countries that could compete with our products. 

 
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If competitors are able to obtain marketing approval for biosimilars referencing our products, our products may become subject to competition from such 
biosimilars, with the attendant competitive pressure and consequences
Competitors could enter the market with generic versions of Dojolvi or our small-molecule product candidates, which may result in a material decline in 
sales of affected products. 
Under the Hatch-Waxman Act, a pharmaceutical manufacturer may file an abbreviated new drug application, or ANDA, seeking approval of a generic 
copy of an approved, innovator small-molecule product such as Dojolvi. Under the Hatch-Waxman Act, a manufacturer may also submit an NDA under 
section 505(b)(2) that references the FDA’s finding of safety and effectiveness of a previously approved innovator small-molecule product. A 505(b)(2) NDA 
product may be for a new or improved version of the original innovator product. Innovative small-molecule drugs may be eligible for certain periods of 
regulatory exclusivity (e.g., five years for new chemical entities, three years for changes to an approved drug requiring a new clinical study, and seven years 
for orphan drugs), which preclude FDA approval (or in some circumstances, FDA filing and review of) an ANDA or 505(b)(2) NDA relying on the FDA’s finding 
of safety and effectiveness for the innovative drug. In addition to the benefits of regulatory exclusivity, an innovator NDA holder may have patents claiming 
the active ingredient, product formulation or an approved use of the drug, which would be listed with the product in the “Orange Book.” If there are patents 
listed in the Orange Book, a generic applicant that seeks to market its product before expiration of the patents must include in the ANDA or 505(b)(2) what is 
known as a “Paragraph IV certification,” challenging the validity or enforceability of, or claiming non-infringement of, the listed patent or patents. Notice of 
the certification must be given to the innovator, too, and if within 45 days of receiving notice the innovator sues to enforce its patents, approval of the ANDA 
is stayed for 30 months, or as lengthened or shortened by the court. 
During the year ended December 31, 2024, Navinta, Aurobindo, and Esjay filed ANDAs for generic versions of Dojolvi. We have filed a patent 
infringement suit under the Hatch-Waxman Act against Navinta, Aurobindo and Esjay in the United States District Court for the District of New Jersey in 
response to the notices. See “Item 3. Legal Proceedings” below for a description of our suit. We cannot predict the outcome of our suit, nor can we predict 
whether there will be additional ANDA filings for Dojolvi. 
There have been a number of recent regulatory and legislative initiatives designed to encourage generic competition for small-molecule 
pharmaceutical products. For instance, in December 2019, the Creating and Restoring Equal Access to Equivalent Samples Act, or the CREATES Act, was 
enacted, which provides a legislatively defined private right of action under which eligible product developers can bring suit against companies who refuse to 
sell sufficient quantities of their branded products on commercially reasonable, market-based terms to support such eligible product developers’ marketing 
applications. It is our policy to evaluate requests for samples of our branded products, and to provide samples in response to bona fide, CREATES Act-
compliant requests from qualified third parties, including generic manufacturers. 
We may not be successful in securing or maintaining proprietary patent protection for products and technologies we develop or license. Moreover, if 
any patents that are granted and listed in the Orange Book are successfully challenged by way of a Paragraph IV certification and subsequent litigation, the 
affected product could more immediately face generic competition and its sales would likely decline materially. For instance, if the existing ANDA filers or 
additional competitors are able to enter the market with generic versions of Dojolvi, our sales of Dojolvi could materially decline which could have an adverse 
impact on our financial results.
The patent protection and patent prosecution for some of our products and product candidates is dependent on third parties. 
While we normally seek and gain the right to fully prosecute the patents relating to our products or product candidates, there may be times when 
patents relating to our products or product candidates are controlled by our licensors. This is the case with our license agreements with KKC and Regeneron, 
who are primarily responsible for the prosecution of certain patents and patent applications covering Crysvita and Evkeeza, respectively. 
In addition, we have in-licensed various patents and patent applications owned by the University of Pennsylvania relating to our DTX301, DTX401 
and/or UX701 product candidates. Some of these patents and patent applications are licensed or sublicensed by REGENX and sublicensed to us. We do not 
have the right to control the prosecution of these patent applications, or the maintenance of any of these patents. In addition, under our agreement with 
REGENX, we do not have the first right to enforce the licensed patents, and our enforcement rights are subject to certain limitations that may adversely 
impact our ability to use the licensed patents to exclude others from commercializing competitive products. Moreover, REGENX and the University of 
Pennsylvania may have interests which differ from ours in determining whether to enforce and the manner in which to enforce such patents.
If KKC, Regeneron, the University of Pennsylvania, REGENX, or any of our future licensing partners fail to appropriately prosecute, maintain, and 
enforce patent protection for the patents covering any of our products or product candidates, our ability to develop and commercialize those products or 
product candidates may be adversely affected and we may not be able to prevent competitors from making, using, and selling competing products. In 
addition, even where we now have the right to control patent 

 
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prosecution of patents and patent applications we have licensed from third parties, we may still be adversely affected or prejudiced by actions or inactions of 
our licensors and their counsel that took place prior to us assuming control over patent prosecution. 
If we fail to comply with our obligations in the agreements under which we license intellectual property and other rights from third parties or otherwise 
experience disruptions to our business relationships with our licensors, we could lose license rights that are important to our business. 
We are a party to a number of intellectual property license agreements that are important to our business and expect to enter into additional license 
agreements in the future. Our existing license agreements impose, and we expect that future license agreements will impose, various diligence, milestone 
payment, royalty, and other obligations on us. If we fail to comply with our obligations under these agreements, or we are subject to a bankruptcy, we may 
be required to make certain payments to the licensor, we may lose the exclusivity of our license, or the licensor may have the right to terminate the license, 
in which event we would not be able to develop or market products covered by the license. Additionally, the milestone and other payments associated with 
these licenses will make it less profitable for us to develop our product candidates. 
In certain cases, we control the prosecution of patents resulting from licensed technology. In the event we breach any of our obligations related to 
such prosecution, we may incur significant liability to our licensing partners. Licensing of intellectual property is of critical importance to our business and 
involves complex legal, business, and scientific issues. Disputes may arise regarding intellectual property subject to a licensing agreement, including but not 
limited to: 
•
the scope of rights granted under the license agreement and other interpretation-related issues; 
•
the extent to which our technology and processes infringe on intellectual property of the licensor that is not subject to the licensing agreement; 
•
the sublicensing of patent and other rights; 
•
our diligence obligations under the license agreement and what activities satisfy those diligence obligations; 
•
the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our 
collaborators; and 
•
the priority of invention of patented technology. 
If disputes over intellectual property and other rights that we have licensed prevent or impair our ability to maintain our current licensing 
arrangements on acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates. 
From time to time, we are involved in lawsuits to protect or enforce our patents or the patents of our licensors, or may be subject to claims that challenge 
the inventorship or ownership of our patents or other intellectual property, which could be expensive, time consuming, and result in unfavorable 
outcomes. 
Competitors have in the past and may in the future infringe our patents or the patents of our licensors. If we or one of our licensing partners were to 
initiate legal proceedings against a third party to enforce a patent covering our products or one of our product candidates, the defendant could counterclaim 
that the patent covering our product or product candidate is invalid and/or unenforceable. For example, in September 2024, we filed a patent infringement 
suit under the Hatch-Waxman Act against Navinta, Aurobindo and Esjay. See “ – Legal Proceedings” below for more information regarding our suit. In patent 
litigation in the U.S., defendant counterclaims alleging invalidity and/or unenforceability are commonplace. Grounds for a validity challenge could be an 
alleged failure to meet any of several statutory requirements, including lack of novelty, obviousness, or non-enablement. Grounds for an unenforceability 
assertion could be an allegation that someone connected with prosecution of the patent withheld relevant information from the USPTO, or made a 
misleading statement, during prosecution. The outcome following legal assertions of invalidity and unenforceability is unpredictable.
Interference proceedings or derivation proceedings now available under the Leahy-Smith Act provoked by third parties or brought by us or declared 
or instituted by the USPTO may be necessary to determine the priority of inventions with respect to our patents or patent applications or those of our 
licensors. An unfavorable outcome could require us to cease using the related technology or to attempt to license rights to it from the prevailing party. Our 
business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms. In addition, the validity of our patents could 
be challenged in the USPTO by one of the new post grant proceedings (i.e., inter partes review or post grant review) now available under the Leahy-Smith 
Act. Our defense of litigation, interference proceedings, or post grant proceedings under the Leahy-Smith Act may fail and, even if successful, may result in 
substantial costs and distract our management and other employees. 

 
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We may in the future also be subject to claims that former employees, collaborators, or other third parties have an interest in our patents as an 
inventor or co-inventor. In addition, we may have ownership disputes arise from conflicting obligations of consultants or others who are involved in 
developing our product candidates. Litigation may be necessary to defend against these and other claims challenging inventorship or ownership. If we fail to 
successfully defend against such litigation or claims, in addition to paying monetary damages, we may lose valuable intellectual property rights, such as 
exclusive ownership of, or right to use, valuable intellectual property. 
Even if we are successful in defending against such litigation and claims, such proceedings could result in substantial costs and distract our 
management and other employees. Because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk 
that some of our confidential information could be compromised by disclosure during litigation. There could also be public announcements of the results of 
hearings, motions, or other interim proceedings or developments related to such litigation or claims. If securities analysts or investors perceive these results 
to be negative, it could have a material adverse effect on the price of our common stock.
We may be subject to claims that our employees, consultants, or independent contractors have wrongfully used or disclosed confidential information of 
third parties or that our employees have wrongfully used or disclosed alleged trade secrets of their former employers. 
We employ certain individuals who were previously employed at universities or other biotechnology or pharmaceutical companies, including our 
competitors or potential competitors. Our efforts to vet our employees, consultants, and independent contractors and prevent their use of the proprietary 
information or know-how of others in their work for us may not be successful, and we may in the future be subject to claims that our employees, 
consultants, or independent contractors have wrongfully used or disclosed confidential information of third parties. If we fail in defending any such claims, in 
addition to paying monetary damages, we may lose valuable intellectual property rights or personnel, which could adversely impact our business. Even if we 
are successful in defending against such claims, litigation could result in substantial costs and distract management and other employees. 
Changes to patent laws in the U.S. and other jurisdictions could diminish the value of patents in general, thereby impairing our ability to protect our 
products. 
As is the case with other biotechnology and pharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. 
Obtaining and enforcing patents in the biotechnology and pharmaceutical industries involves both technological and legal complexity. Therefore, obtaining 
and enforcing such patents is costly, time consuming, and inherently uncertain. 
In recent years, the U.S. Supreme Court has ruled on several patent cases, and in some instances, narrowed the scope of patent protection available. 
In addition, there have been recent proposals for changes to U.S. laws that, if adopted, could impact our ability to obtain or maintain patent protection for 
our proprietary technologies. Depending on future actions by U.S. courts, U.S. Congress, the USPTO, and the relevant lawmaking bodies in other countries, 
the laws and regulations governing patents could change in unpredictable ways that could weaken our ability to obtain new patents, shorten the term of our 
existing patents and patents that we might obtain in the future, or impair the validity or enforceability of our patents that may be asserted against our 
competitors or other third parties. Any of these outcomes could have a material adverse effect on our business. 
We may not be able to protect our intellectual property rights throughout the world. 
Filing, prosecuting, and defending patents on our products or product candidates in all countries throughout the world would be prohibitively 
expensive, and our intellectual property rights in some countries outside the U.S. can be less extensive than those in the U.S. In addition, the laws of some 
foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the U.S. Further, licensing partners such as KKC 
and Regeneron may not prosecute patents in certain jurisdictions in which we may obtain commercial rights, thereby precluding the possibility of later 
obtaining patent protection in these countries. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries 
outside the U.S., or from selling or importing products made using our inventions in and into the U.S. or other jurisdictions. Competitors may use our 
technologies in jurisdictions where we have not obtained patent protection to develop their own products and may also export infringing products to 
territories where we have patent protection, but enforcement is not as strong as that in the U.S. These products may compete with our products, and our 
patents or other intellectual property rights may not be effective or sufficient to prevent them from competing. 

 
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Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal 
systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets, and other intellectual 
property protection, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement of our patents or 
marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions, whether or 
not successful, could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being 
invalidated or interpreted narrowly, could put our patent applications at risk of not issuing, and could provoke third parties to assert claims against us. We 
may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our 
efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual 
property that we develop or license.
Risks Related to Our Business Operations 
We have limited experience as a company operating our own manufacturing facility and may experience unexpected costs or challenges.
Prior to construction of our Bedford, Massachusetts gene therapy manufacturing facility in 2023, we did not previously have experience as a company 
in operating our own manufacturing facility and at this point, we cannot assure that the facility will be fully utilized at all times. While our employees may be 
experienced in running a manufacturing facility, our limited experience as a company may contribute to unacceptable or inconsistent product quality success 
rates and yields, and we may be unable to maintain adequate quality control, quality assurance, and qualified personnel. We have incurred and will continue 
to incur significant expenses and costs to operate the facility, which may be subject to significant impairment if our gene therapy programs are unsuccessful. 
Before we can begin to commercially manufacture any of our product candidates at the facility, we must obtain regulatory approval from the FDA for our 
manufacturing processes and for the facility. In order to obtain approval, we will need to ensure that all of our processes, quality systems, methods, 
equipment, policies and procedures are compliant with cGMP. Until recently, few gene therapy products manufactured by a cGMP gene therapy 
manufacturing facility in the U.S. had received approval from the FDA; therefore, the time frame required for us to obtain such approval is uncertain. The 
cGMP requirements govern quality control of the manufacturing process and documentation policies and procedures. In complying with cGMP, we will be 
obligated to spend time, money and effort on production, record keeping and quality control to assure that the product meets applicable specifications and 
other requirements. If we fail to comply with these requirements, we would be subject to possible regulatory action and may not be permitted to sell any 
products that we may develop.
As we seek to optimize and operate our manufacturing process at the facility, we will likely face technical and scientific challenges, considerable 
capital costs and potential difficulty in recruiting and hiring experienced, qualified personnel at the facility which could result in delays in our production or 
difficulties in maintaining compliance with applicable regulatory requirements. We may also experience unexpected technical, regulatory, safety, quality or 
operational issues during manufacturing campaigns. As we expand our commercial footprint to multiple geographies, we may establish multiple 
manufacturing facilities, which may lead to regulatory delays or prove costly. Even if we are successful, we cannot assure that such additional capacity will be 
required or that our investment will be recouped. Further, our manufacturing capabilities could be affected by cost-overruns, unexpected delays, equipment 
failures, lack of capacity, labor shortages, natural disasters, power failures, program failures, actual or threatened public health emergencies, and numerous 
other factors that could prevent us from realizing the intended benefits of our manufacturing strategy.
Our future success depends in part on our ability to retain our Founder, President, and Chief Executive Officer and to attract, retain, and motivate other 
qualified personnel. 
We are dependent on Emil D. Kakkis, M.D., Ph.D., our Founder, President, and Chief Executive Officer, the loss of whose services may adversely 
impact the achievement of our objectives. Dr. Kakkis could leave our employment at any time, as he is an “at will” employee. Recruiting and retaining other 
qualified employees, consultants, and advisors for our business, including scientific and technical personnel, will also be critical to our success. There is 
currently a shortage of skilled personnel in our industry, which is likely to continue. As a result, competition for skilled personnel is intense and the turnover 
rate can be high. In addition, failure to succeed in preclinical or clinical studies may make it more challenging to recruit and retain qualified personnel. The 
inability to recruit and retain qualified personnel, or the loss of the services of Dr. Kakkis or any of other member of our executive leadership team or other 
key employee, may impede the progress of our research, development, and commercialization objectives.

 
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If we fail to obtain or maintain orphan drug exclusivity for our products, our competitors may sell products to treat the same conditions and our revenue 
will be reduced. If another party obtains orphan drug exclusivity for a product that is essentially the same as a product we are developing for a particular 
indication, we may be precluded or delayed from commercializing the product in that indication. 
Our business strategy focuses on the development of drugs that are eligible for FDA and EU orphan drug designation. In the U.S., orphan drug 
designation entitles a party to financial incentives such as opportunities for grant funding towards clinical study costs, tax advantages, and user-fee waivers. 
In addition, if a product receives the first FDA approval for the indication for which it has orphan designation, the product is entitled to orphan drug 
exclusivity, which means the FDA may not approve any other application to market the same drug for the same indication for a period of seven years, except 
in limited circumstances, such as a showing of clinical superiority over the product with orphan exclusivity or where the manufacturer is unable to assure 
sufficient product quantity. In the EU, orphan drug designation entitles a party to financial incentives such as reduction of fees or fee waivers and ten years of 
market exclusivity following drug or biological product approval. This period may be reduced to six years if the orphan drug designation criteria are no longer 
met, including where it is shown that the product is sufficiently profitable not to justify maintenance of market exclusivity. 
Because the extent and scope of patent protection for our products may in some cases be limited, orphan drug designation is especially important for 
our products for which orphan drug designation may be available. For eligible drugs, we plan to rely on the exclusivity period under the Orphan Drug Act to 
maintain a competitive position. If we do not obtain orphan drug exclusivity for our drug products and biologic products that do not have broad patent 
protection, our competitors may then sell the same drug to treat the same condition sooner than if we had obtained orphan drug exclusivity, and our 
revenue will be reduced. Additionally, if a competitor obtains approval of the same drug for the same indication before us, and the FDA grants such orphan 
drug exclusivity, we would be prohibited from obtaining approval for our product for seven or more years, unless our product can be shown to be clinically 
superior. 
Even though we have orphan drug designation for UX111, UX143, DTX301, DTX401 and UX701 in the U.S. and Europe and for GTX 102 in the U.S., we 
may not be the first to obtain marketing approval for any particular orphan indication due to the uncertainties associated with developing pharmaceutical 
products. Further, even if we obtain orphan drug exclusivity for a product, that exclusivity may not effectively protect the product from competition because 
different drugs with different active moieties can be approved for the same condition or the same drug can be approved for a different indication unless 
there are other exclusivities such as new chemical entity exclusivity preventing such approval. Even after an orphan drug is approved, the FDA or EMA can 
subsequently approve the same drug with the same active moiety for the same condition if the FDA or EMA concludes that the later drug is safer, more 
effective, or makes a major contribution to patient care. Orphan drug designation neither shortens the development time or regulatory review time of a drug 
nor gives the drug any advantage in the regulatory review or approval process. 
Our operating results would be adversely impacted if our intangible assets become impaired. 
We have recorded on our Consolidated Balance Sheets intangible assets for in-process research and development, or IPR&D, related to DTX301 and 
DTX401 as a result of the accounting for our acquisition of Dimension Therapeutics. We also recorded intangible assets related to our licenses for Dojolvi and 
Evkeeza. We test the intangible assets for impairment annually during the fourth quarter and more frequently if events or changes in circumstances indicate 
that it is more likely than not that the asset is impaired. If the associated research and development effort is abandoned, the related assets will be written-off 
and we will record a noncash impairment loss on our Consolidated Statement of Operations. We have not recorded any impairments related to our 
intangible assets through December 31, 2024.
We may not be successful in our efforts to identify, license, discover, develop, or commercialize additional product candidates. 
The success of our business depends upon our ability to identify, license, discover, develop, or commercialize additional product candidates in 
addition to the continued clinical testing, potential approval, and commercialization of our existing product candidates. Research programs to identify and 
develop new product candidates require substantial technical, financial, and human resources. We may focus our efforts and resources on potential 
programs or product candidates that ultimately prove to be unsuccessful. Our research programs or licensing efforts may fail to yield additional product 
candidates for clinical development and commercialization for a number of reasons, including but not limited to the following: 
•
our research or business development methodology or search criteria and process may be unsuccessful in identifying potential product 
candidates; 
•
we may not be able or willing to assemble sufficient technical, financial or human resources to acquire or discover additional product candidates; 

 
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•
we may face competition in obtaining and/or developing additional product candidates; 
•
our product candidates may not succeed in research, discovery, preclinical or clinical testing; 
•
our potential product candidates may be shown to have harmful side effects or may have other characteristics that may make the products 
unmarketable or unlikely to receive marketing approval; 
•
competitors may develop alternatives that render our product candidates obsolete or less attractive; 
•
product candidates we develop may be covered by third parties’ patents or other exclusive rights; 
•
the market for a product candidate may change during our program so that such a product may become unreasonable to continue to develop; 
•
a product candidate may not be capable of being produced in commercial quantities at an acceptable cost or at all; and 
•
a product candidate may not be accepted as safe and effective by regulatory authorities, patients, the medical community, or payors. 
If any of these events occur, we may be forced to abandon our development efforts for a program or programs, or we may not be able to identify, 
license, discover, develop, or commercialize additional product candidates, which would have a material adverse effect on our business and could potentially 
cause us to cease operations.
We may expend our limited resources to pursue a particular product, product candidate or indication and fail to capitalize on products, product 
candidates or indications that may be more profitable or for which there is a greater likelihood of success.
Because we have limited financial and managerial resources, we focus our sales, marketing and research programs on certain products, product 
candidates or for specific indications. As a result, we may forego or delay pursuit of opportunities with other products or product candidates or other 
indications that later prove to have greater commercial potential. Our resource allocation decisions may cause us to fail to capitalize on viable commercial 
products or profitable market opportunities. Our spending on current and future research and development programs and product candidates may not yield 
any commercially viable products. If we do not accurately evaluate the commercial potential or target market for a particular product or product candidate, 
we may relinquish valuable rights through collaboration, licensing, or other royalty arrangements in cases in which it would have been advantageous for us 
to retain sole development and commercialization rights or we may allocate internal resources to a product candidate in a therapeutic area in which it would 
have been more advantageous to enter into a partnering arrangement.
Changes to healthcare and FDA laws, regulations, and policies may have a material adverse effect on our business and results of operations. 
As described above in “Item 1. Business – Government Regulation” and in the Risk Factor above entitled “ – The insurance coverage and 
reimbursement status of newly approved products is uncertain” there have been and continue to be a number of legislative initiatives to contain healthcare 
costs and to modify the regulation of drug and biologic products. We expect that additional state and federal healthcare reform measures and regulations 
will be adopted in the future, including proposals to reduce the exclusivity protections provided to already approved biological products and to provide 
biosimilar and interchangeable biologic products an easier path to approval. Any of these measures and regulations could limit the amounts that federal and 
state governments will pay for healthcare products and services, result in reduced demand for our product candidates or additional pricing pressures and 
affect our product development, testing, marketing approvals and post-market activities.
Failure to comply with laws and regulations could harm our business and our reputation. 
Our business is subject to evolving regulation by various federal, state, local and foreign governmental agencies, including agencies responsible for 
monitoring and enforcing employment and labor laws, workplace safety, privacy and security laws and regulations, and tax laws and regulations. In certain 
jurisdictions, these regulatory requirements may be more stringent than those in the U.S., and in other circumstances these requirements may less stringent 
than those in the U.S.

 
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In particular, our operations are directly, and indirectly through our customers, subject to various federal and state fraud and abuse laws, including, 
without limitation, the federal Anti-Kickback Statute, the federal False Claims Act, and physician sunshine laws and regulations; and patient and non-patient 
privacy regulations, including the GDPR and the California Consumer Privacy Act, or CCPA, including amendments from the California Privacy Rights Act, or 
CPRA, as described above in “Item 1. Business – Government Regulation”. Because of the breadth of these laws and the narrowness of the statutory 
exceptions and safe harbors available, it is possible that some of our business activities could be subject to challenge under one or more of such laws. For 
instance, one of our programs for sponsored genetic testing to help patients receive an accurate diagnosis was previously the subject of review by applicable 
governmental authorities of compliance with various fraud and abuse laws. We settled the matter with the governmental authorities for an immaterial 
settlement amount and without any admission of legal liability. We cannot assure that our other operations or programs will not be subject to review by 
governmental authorities or found to violate such laws.
The GDPR imposes a number of strict obligations and restrictions on the ability to process personal data of individuals, in particular with respect to 
special categories of personal data like health data (e.g., reliance on a legal basis, information to individuals, notification to relevant national data protection 
authorities in case of personal data breach and implementation of appropriate security measures). EU member states may also impose additional 
requirements in relation to special categories of personal data through their national legislation. In addition, the GDPR imposes specific restrictions on the 
transfer of personal data to countries outside of the EEA that are not considered by the European Commission as providing an adequate level of protection 
(including the U.S.). Appropriate safeguards are required to enable such transfers (e.g., reliance on standard contractual clauses and transfer risk 
assessments). There are also several compliance requirements under the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, as 
amended by the Health Information Technology for Economic and Clinical Health Act, or HITECH, and implementing regulations that create requirements 
relating to the privacy and security of protected health information. Those requirements are also applicable, in many instances, to business associates of 
covered entities. In some cases, depending on our business operations and contractual agreements, including through the conduct of clinical trials, we are 
subject to HIPAA requirements. Also, we may be subject to additional federal, state and local privacy laws and regulations in the U.S., including new and 
recently enacted laws, that may apply to us and/or our service providers now or in the future and that require that we take measures to be transparent 
regarding, honor rights with respect to, and protect the privacy and security of certain information we gather and use in our business, including personal 
information, particularly personal information that is not otherwise subject to HIPAA.
If our operations are found to be in violation of any of the laws described above or any other governmental regulations that apply to us, we may be 
subject to penalties, including civil and criminal penalties, damages, fines, exclusion from participation in government health care programs, such as 
Medicare and Medicaid, imprisonment, disgorgement of profits, and the curtailment or restructuring of our operations. If any governmental sanctions, fines, 
or penalties are imposed, or if we do not prevail in any possible civil or criminal litigation, our business, operating results, financial condition and our 
reputation could be harmed. In addition, responding to any action will likely result in a significant diversion of management’s attention and resources and an 
increase in professional fees.
Our research and development activities, including our process and analytical development activities in our quality control laboratory, and our and 
our third-party manufacturers’ and suppliers’ activities, including activities related to the build-out and operation of our gene therapy manufacturing facility, 
involve the controlled storage, use, and disposal of hazardous materials, including the components of our product candidates, such as viruses, and other 
hazardous compounds, which subjects us to laws and regulations governing such activities. In some cases, these hazardous materials and various wastes 
resulting from their use are stored at our or our manufacturers’ facilities pending their use and disposal. We cannot eliminate the risk of contamination, 
which could cause an interruption of our commercialization efforts, research and development efforts, and business operations or environmental damage 
that could result in costly clean-up and liabilities under applicable laws and regulations governing the use, storage, handling, and disposal of these materials 
and specified waste products. We cannot guarantee that the safety procedures utilized by us and our third-party manufacturers for handling and disposing of 
these materials comply with the standards prescribed by these laws and regulations, or eliminate the risk of accidental contamination or injury from these 
materials. In such an event, we may be held liable for any resulting damages—and such liability could exceed our resources—and state or federal or other 
applicable authorities may curtail our use of certain materials and/or interrupt our business operations. Furthermore, environmental laws and regulations 
are complex, change frequently, and have tended to become more stringent. We cannot predict the impact of such changes and cannot be certain of our 
future compliance.

 
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Additionally, as we and our employees increasingly use social media tools as a means of communication with the public, there is a risk that the use of 
social media by us or our employees to communicate about our products or business may cause to be found in violation of applicable laws, despite our 
attempts to monitor such social media communications through company policies and guidelines. In addition, our employees may knowingly or inadvertently 
make use of social media in ways that may not comply with our company policies or other legal or contractual requirements, which may give rise to liability, 
lead to the loss of trade secrets or other intellectual property, cause reputational harm or result in public exposure of personal information of our 
employees, clinical trial patients, customers, and others.
International expansion of our business exposes us to business, regulatory, political, operational, financial, and economic risks associated with doing 
business outside of the U.S. 
Our business strategy includes international expansion. We currently conduct clinical studies and regulatory activities and we also commercialize 
products outside of the U.S. An increasing portion of our revenues are based on our international operations, which exposes us to increased financial risks 
such as longer payment cycles, additional or more burdensome regulatory requirements of financial institutions outside of the U.S. and exposure to foreign 
currency exchange rate. We may implement currency hedges intended to reduce our exposure to changes in certain foreign currency exchange rates. 
However, our hedging strategies, if implemented, may not be successful, and any of our unhedged foreign exchange exposures will continue to be subject to 
market fluctuations. Further, we sell products in countries that face economic volatility and weakness. Although we have historically collected receivables 
from customers in those countries, continued weakness or additional deterioration of the local economies and currencies may cause customers in those 
countries to be unable to pay for our products. Additionally, if one or more of these countries were unable to purchase our products, our revenues would be 
adversely affected.
Doing business internationally involves a number of additional risks, including but not limited to:
•
multiple, conflicting, and changing laws and regulations such as privacy and data regulations, transparency regulations, tax laws, export and 
import restrictions, employment laws, regulatory requirements, and other governmental approvals, permits, and licenses;
•
export and import restrictions, including the impact from new or increased sanctions and tariffs, or threats or changes in policy with respect to 
sanctions or tariffs, that are contemplated or could be implemented by the current Presidential administration and by other countries against 
the U.S. in response; 
•
introduction of new health authority requirements and/or changes in health authority expectations; 
•
failure by us to obtain and maintain regulatory approvals for the use of our products in various countries; 
•
additional potentially relevant third-party patent rights; 
•
complexities and difficulties in obtaining protection for, and enforcing, our intellectual property; 
•
difficulties in staffing and managing foreign operations; 
•
complexities associated with managing multiple payor reimbursement regimes, government payors, or patient self-pay systems; 
•
limits on our ability to penetrate international markets; 
•
natural disasters and geopolitical and economic instability, including wars, terrorism, political unrest (including, for example the conflict between 
Russia and Ukraine, the conflict between Israel and the surrounding areas, and the rising tensions between China and Taiwan), results of certain 
elections and votes, actual or threatened public health emergencies and outbreak of disease, inflation, recession, boycotts and resulting staffing 
shortages, adoption or expansion of government trade restrictions, and other business restrictions; 
•
certain expenses including, among others, expenses for travel, translation, and insurance; 
•
regulatory and compliance risks that relate to maintaining accurate information and control over commercial operations and activities that may 
fall within the purview of the U.S. Foreign Corrupt Practices Act, or FCPA, its books and records provisions, or its anti-bribery provisions, including 
those under the U.K. Bribery Act and similar anti-corruption foreign laws and regulations; and
•
regulatory and compliance risks relating to doing business with any entity that is subject to sanctions administered by the Office of Foreign 
Assets Control of the U.S. Department of the Treasury. 
Any of these factors could significantly harm our future international expansion and operations and, consequently, our results of operations. 

 
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Our employees or consultants may engage in misconduct or other improper activities, including non-compliance with regulatory standards and 
requirements, which could cause significant liability for us and harm our reputation. 
We are exposed to the risk of employee fraud or other misconduct, including intentional failures to comply with FDA regulations or similar regulations 
of comparable foreign regulatory authorities, provide accurate information to the FDA or comparable foreign regulatory authorities, comply with 
manufacturing standards, comply with federal and state healthcare fraud and abuse laws and regulations and similar laws and regulations established and 
enforced by comparable foreign regulatory authorities, report financial information or data accurately or disclose unauthorized activities to us. Employee or 
consultant misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions 
and serious harm to our reputation. This could include violations of HIPAA, other U.S. federal and state law, and requirements of non-U.S. jurisdictions, 
including the EU Data Protection Directive. It is not always possible to identify and deter employee or consultant misconduct, and the precautions we take to 
detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental 
investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws, standards, regulations, guidance or codes of conduct. 
If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant 
impact on our business and results of operations, including the imposition of significant fines or other sanctions.
The FDA and other regulatory agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses. If we are found to have 
promoted off-label uses, we may become subject to significant liability.
The FDA and other regulatory agencies strictly regulate the promotional claims that may be made about prescription drug products. In particular, a 
product may not be promoted in the U.S. for uses that are not approved by the FDA as reflected in the product's approved labeling or prior to regulatory 
approval. Further, any labeling approved by the FDA for our products or any of our product candidates may include restrictions on use, limit use to specific 
populations or include various other limitations. The FDA may impose further requirements or restrictions on the distribution or use of any of our other 
product candidates as part of a REMS plan. Physicians may nevertheless prescribe such products to their patients in a manner that is inconsistent with the 
approved label provided the company did not promote such use. If we are found to have promoted such off-label uses, we may become subject to significant 
liability. Similarly, the FDA strictly regulates the promotion of investigational products prior to approval, known as pre-approval promotion. The federal 
government has levied large civil and criminal fines and/or other penalties against companies for alleged improper promotion and has investigated and/or 
prosecuted several companies in relation to off-label and/or pre-approval promotion. The FDA has also requested that certain companies enter into consent 
decrees or permanent injunctions under which specified promotional conduct is changed, curtailed or prohibited or have delayed approval of investigational 
products due to pre-approval conduct. Inappropriate promotional activities may also subject a company to investigations, prosecutions and litigation by 
other government entities or private citizens
Our business and operations may be materially adversely affected in the event of computer system failures or security breaches.
Cybersecurity incidents, including phishing attacks and attempts to misappropriate or compromise confidential or proprietary information or sabotage 
enterprise IT systems are becoming increasingly frequent and more sophisticated. Cybersecurity incidents increasingly involve the use of AI and machine 
learning to launch more automated, targeted and coordinated attacks on targets. The information and data processed and stored in our technology systems, 
and those of our strategic partners, CROs, contract manufacturers, suppliers, distributors or other third parties for which we depend to operate our business, 
may be vulnerable to loss, damage, denial-of-service, unauthorized access or misappropriation. Data security breaches can occur as a result of malware, 
hacking, business email compromise, ransomware attacks, phishing or other cyberattacks directed by third parties. We, and certain of the third parties for 
which we depend on to operate our business, have experienced cybersecurity incidents, including third party unauthorized access to and misappropriation of 
financial information and clinical data, and may experience similar incidents in the future. Further, risks of unauthorized access and cyber-attacks have 
increased as most of our personnel, and the personnel of many third parties with which we do business, have adopted hybrid working arrangements. 
Improper or inadvertent behavior by employees, contractors and others with permitted access to our systems, including through the use of generative AI 
technologies, pose a risk that sensitive data may be exposed to unauthorized persons or to the public. A system failure or security breach that interrupts our 
operations or the operations at one of our third-party vendors or partners could result in intellectual property and other proprietary or confidential 
information being lost or stolen or a material disruption of our drug development programs and commercial operations. For example, the loss of clinical trial 
data from ongoing or planned clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or 
reproduce the data. To the extent that any disruption or security breach results in a loss of or damage to our data or applications, loss of trade secrets or 
inappropriate disclosure of confidential or proprietary information, including protected health information, or personal information of employees or former 
employees, access to our clinical data, or disruption of the manufacturing process, we could incur liability and the further development of our drug 
candidates could be delayed. Further, we could incur significant costs to investigate and mitigate such 

 
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cybersecurity incidents. In addition, there can be no assurance that our insurance coverage will be sufficient to cover the financial, legal, business or 
reputational losses that may result from a cybersecurity incident. A security breach that results in the unauthorized access, use or disclosure of personal 
information also requires us to notify individuals, governmental authorities, credit reporting agencies, or other parties, as applicable, pursuant to privacy and 
security laws and regulations or other obligations. Such a security breach could harm our reputation, erode confidence in our information security measures, 
and lead to regulatory scrutiny and result in penalties, fines, indemnification claims, litigation and potential civil or criminal liability. 
We or the third parties upon whom we depend may be adversely affected by earthquakes or other natural disasters and our business continuity and 
disaster recovery plans may not adequately protect us from a serious disaster. 
Our corporate headquarters and one of our laboratories are located in the San Francisco Bay Area, and our collaboration partner for Crysvita, KKC, is 
located in Japan, which have both in the past experienced severe earthquakes and other natural disasters. We do not carry earthquake insurance. 
Earthquakes or other natural disasters could severely disrupt our operations or those of our collaborators, and have a material adverse effect on our 
business, results of operations, financial condition, and prospects. We have also experienced power outages as a result of wildfires in the San Francisco Bay 
Area which are likely to continue to occur in the future. If a natural disaster, power outage, or other event occurred that prevented us from using all or a 
significant portion of our headquarters, that damaged critical infrastructure (such as the manufacturing facilities of our third-party contract manufacturers) 
or that otherwise disrupted operations, it may be difficult or, in certain cases, impossible for us to continue our business for a substantial period of time. The 
disaster recovery and business continuity plans we have in place currently are limited and may be inadequate in the event of a serious disaster or similar 
event. We may incur substantial expenses as a result of the limited nature of our disaster recovery and business continuity plans, which, particularly when 
taken together with our lack of earthquake insurance, could have a material adverse effect on our business. 
We may acquire companies or products or engage in strategic transactions, which could divert our management’s attention and cause us to incur various 
costs and expenses, or result in fluctuations with respect to the value of such investment, which could impact our operating results. 
We may acquire or invest in businesses or products that we believe could complement or expand our business or otherwise offer growth 
opportunities. For example, we acquired Dimension in November 2017 and GeneTx in July 2022. The pursuit of potential acquisitions or investments may 
divert the attention of management and may cause us to incur various costs and expenses in identifying, investigating, and pursuing them, whether or not 
they are consummated. We may not be able to identify desirable acquisitions or investments or be successful in completing or realizing anticipated benefits 
from such transactions. We may experience difficulties in assimilating the personnel, operations and products of the acquired companies, management’s 
attention may be diverted from other business concerns and we may potentially lose key employees of the acquired company. If we are unable to 
successfully or timely integrate the operations of acquired companies with our business, we may incur unanticipated liabilities and be unable to realize the 
revenue growth, synergies and other anticipated benefits resulting from the acquisition, and our business, results of operations and financial condition could 
be materially and adversely affected.
The value of our investments in other companies or businesses may also fluctuate significantly and impact our operating results quarter to quarter or 
year to year. We purchased 7,825,797 shares of common stock of Solid in October 2020. Our investment in Solid is being accounted for at fair value, as the 
fair value is readily determinable. As a result, increases or decreases in the stock price of equity investments have resulted in and will result in accompanying 
changes in the fair value of our investments, and cause substantial volatility in, our operating results for the reporting period. As the fair value of our 
investment in Solid is dependent on the stock price of Solid, which has recently seen wide fluctuations, the value of our investments and the impact on our 
operating results may similarly fluctuate significantly from quarter to quarter and year to year such that period-to-period comparisons may not be a good 
indication of the future value of the investments and our future operating results.
Risks Related to Ownership of Our Common Stock 
The market price of our common stock may be highly volatile. 
The market price of our common stock has been, and is likely to continue to be, volatile, including for reasons unrelated to changes in our business. 
Our stock price could be subject to wide fluctuations in response to a variety of factors, including but not limited to the following: 
•
adverse results or delays in preclinical or clinical studies; 
•
any inability to obtain additional funding; 

 
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•
any delay in filing an IND, NDA, BLA, MAA, or other regulatory submission for any of our product candidates and any adverse development or 
perceived adverse development with respect to the applicable regulatory agency’s review of that IND, NDA, BLA, MAA, or other regulatory 
submission; 
•
the perception of limited market sizes or pricing for our products and product candidates; 
•
decisions by our collaboration partners with respect to the indications for our products and product candidates in countries where they have the 
right to commercialize the products and product candidates;
•
decisions by our collaboration partners regarding market access and pricing in countries where they have the right to commercialize our 
products and product candidates;
•
failure to successfully develop and commercialize our products and product candidates; 
•
the level of revenue we receive from our commercialized products or from named patient sales;
•
post-marketing safety issues; 
•
failure to maintain our existing strategic collaborations or enter into new collaborations; 
•
failure by us or our licensors and strategic collaboration partners to prosecute, maintain, or enforce our intellectual property rights; 
•
changes in laws or regulations applicable to our products; 
•
any inability to obtain adequate product supply for our products and product candidates or the inability to do so at acceptable prices; 
•
adverse regulatory decisions; 
•
introduction of new products, services, or technologies by our competitors; 
•
changes in or failure to meet or exceed financial projections or other guidance we may provide to the public; 
•
changes in or failure to meet or exceed the financial projections or other expectations of the investment community; 
•
the perception of the pharmaceutical industry or our company by the public, legislatures, regulators, and the investment community; 
•
the perception of the pharmaceutical industry’s approach to drug pricing;
•
announcements of significant acquisitions, strategic partnerships, joint ventures, or capital commitments by us, our strategic collaboration 
partners, or our competitors; 
•
the integration and performance of any businesses we have acquired or may acquire;
•
disputes or other developments relating to proprietary rights, including patents, litigation matters, and our ability to obtain patent protection for 
our technologies; 
•
additions or departures of key scientific or management personnel; 
•
significant investigations, regulatory proceedings or lawsuits, including patent or stockholder litigation; 
•
securities or industry analysts’ reports regarding our stock, or their failure to issue such reports; 
•
changes in the market valuations of similar companies; 
•
general market, macroeconomic conditions or geopolitical developments, changing interest rates and inflation;
•
sales of our common stock by us or our stockholders in the future; and 
•
trading volume of our common stock. 

 
63
In addition, biotechnology and biopharmaceutical companies in particular have experienced extreme price and volume fluctuations that have often 
been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market 
price of our common stock, regardless of our actual operating performance.
Future sales and issuances of our common stock or rights to purchase common stock, including pursuant to our equity incentive plans, could result in 
additional dilution of the percentage ownership of our stockholders and could cause our stock price to fall. 
We will need additional capital in the future to continue our planned operations. To the extent we raise additional capital by issuing equity securities, 
our stockholders may experience substantial dilution. We may sell common stock, convertible securities, or other equity securities in one or more 
transactions at prices and in a manner we determine from time to time. If we sell common stock, convertible securities, or other equity securities in more 
than one transaction, investors may be materially diluted by subsequent sales. These sales may also result in material dilution to our existing stockholders, 
and new investors could gain rights superior to our existing stockholders. 
Pursuant to our 2023 Incentive Plan, as amended, or the 2023 Plan, our management is authorized to grant stock options and other equity-based 
awards to our employees, directors, and consultants. At December 31, 2024, there were 6,139,766 shares available for future grants under the 2023 Plan. 
Pursuant to our 2014 Employee Stock Purchase Plan, as amended, or the A&R ESPP, eligible employees can acquire shares of our common stock at a 
discount to the prevailing market price. At December 31, 2024, there were 6,409,256 shares available for issuance under the A&R ESPP. 
Our board of directors has adopted an Employment Inducement Plan, which was amended in July 2024, or the Inducement Plan, with a maximum of 
1,200,000 shares available for grant under the plan. At December 31, 2024, there were 211,628 shares available for issuance under the Inducement Plan. If 
our board of directors elects to increase the number of shares available for future grant under the 2023 Plan, the A&R ESPP, or the Inducement Plan, our 
stockholders may experience additional dilution, which could cause our stock price to fall.
Provisions in our amended and restated certificate of incorporation and by-laws, as well as provisions of Delaware law, could make it more difficult for a 
third party to acquire us or increase the cost of acquiring us, even if doing so would benefit our stockholders, or remove our current management. 
Our amended and restated certificate of incorporation, amended and restated by-laws, and Delaware law contain provisions that may have the effect 
of delaying or preventing a change in control of us or changes in our management. Our amended and restated certificate of incorporation and by-laws 
include provisions that: 
•
authorize “blank check” preferred stock, which could be issued by our board of directors without stockholder approval and may contain voting, 
liquidation, dividend, and other rights superior to our common stock; 
•
create a classified board of directors whose members serve staggered three-year terms; 
•
specify that special meetings of our stockholders can be called only by our board of directors or the chairperson of our board of directors; 
•
prohibit stockholder action by written consent; 
•
establish an advance notice procedure for stockholder approvals to be brought before an annual meeting of our stockholders, including 
proposed nominations of persons for election to our board of directors; 
•
provide that our directors may be removed only for cause; 
•
provide that vacancies on our board of directors may be filled only by a resolution adopted by the board of directors; 
•
expressly authorize our board of directors to modify, alter or repeal our amended and restated bylaws; and 
•
require holders of 75% of our outstanding common stock to amend specified provisions of our amended and restated certificate of incorporation 
and amended and restated by-laws. 
These provisions, alone or together, could delay, deter, or prevent hostile takeovers and changes in control or changes in our management. 
In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, 
which limits the ability of stockholders owning in excess of 15% of our outstanding voting stock to merge or combine with us. Further, no stockholder is 
permitted to cumulate votes at any election of directors because this right is not included in our amended and restated certificate of incorporation.

 
64
Any provision of our amended and restated certificate of incorporation or amended and restated by-laws or Delaware law that has the effect of 
delaying or deterring a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our common stock, and 
could also affect the price that some investors are willing to pay for our common stock. 
Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware is the sole and exclusive forum for 
substantially all disputes between us and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with 
us or our directors, officers or employees.
Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware is the sole and exclusive forum 
for (1) any derivative action or proceeding brought on our behalf, (2) any action asserting a claim of breach of fiduciary duty owed by any of our directors, 
officers, or other employees to us or to our stockholders, (3) any action asserting a claim against us arising under the Delaware General Corporation Law or 
under our amended and restated certificate of incorporation or bylaws, or (4) any action against us asserting a claim governed by the internal affairs 
doctrine. The choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our 
directors, officers, or other employees, which may discourage such lawsuits against us and our directors, officers, and other employees. Alternatively, if a 
court were to find the choice of forum provision contained in our amended and restated certificate of incorporation to be inapplicable or unenforceable in an 
action, we may incur additional costs associated with resolving such action in other jurisdictions, which could harm our business, operating results and 
financial condition.
General Risk Factors
If we are unable to maintain effective internal control over financial reporting, investors may lose confidence in the accuracy and completeness of our 
financial reports and the market price of our stock may decrease. 
The Sarbanes-Oxley Act requires, among other things, that we maintain effective internal controls for financial reporting and disclosure controls and 
procedures. In particular, we are required to perform system and process evaluation and testing of our internal controls over financial reporting to allow 
management to report on the effectiveness of our internal controls over financial reporting, as required by Section 404(a) of the Sarbanes-Oxley Act. Section 
404(b) of the Sarbanes-Oxley Act also requires our independent auditors to attest to, and report on, this management assessment. Ensuring that we have 
adequate internal controls in place so that we can produce accurate financial statements on a timely basis is a costly and time-consuming effort that will 
need to be evaluated frequently. If we are not able to comply with the requirements of Section 404 or if we or our independent registered public accounting 
firm are unable to attest to the effectiveness of our internal control over financial reporting, investors may lose confidence in the accuracy and completeness 
of our financial reports, the market price of our stock could decline and we could be subject to sanctions or investigations by Nasdaq, the SEC, or other 
regulatory authorities, which would require additional financial and management resources.

 
65
We may incur additional tax liabilities related to our operations.
We have a multinational tax structure and are subject to income tax in the U.S. and various foreign jurisdictions. Our effective tax rate is influenced by 
many factors including changes in our operating structure, changes in the mix of our earnings among countries, our allocation of profits and losses among 
our subsidiaries, our intercompany transfer pricing agreements and rules relating to transfer pricing, the availability of U.S. research and development tax 
credits, and future changes in tax laws and regulations in the U.S. and foreign countries. Significant judgment is required in determining our tax liabilities 
including management’s judgment for uncertain tax positions. The Internal Revenue Service, other domestic taxing authorities, or foreign taxing authorities 
may disagree with our interpretation of tax laws as applied to our operations. Our reported effective tax rate and after-tax cash flows may be materially and 
adversely affected by tax assessments in excess of amounts accrued for our financial statements. This could materially increase our future effective tax rate 
thereby reducing net income and adversely impacting our results of operations for future periods.
Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited. 
We have incurred substantial losses during our history. To the extent that we continue to generate taxable losses, unused taxable losses will, subject 
to certain limitations, carry forward to offset future taxable income, if any, until such unused losses expire. Under Sections 382 and 383 of the Internal 
Revenue Code of 1986, as amended, or the IRC, if a corporation undergoes an “ownership change,” generally defined as a greater than 50% change (by 
value) in its equity ownership over a three-year period, the corporation’s ability to use its pre-change net operating loss carryforwards, or NOL carryforwards, 
and other pre-change tax attributes (such as research tax credits) to offset its post-change income may be limited. An analysis to determine limitations upon 
our NOL carryforwards and other pre-change tax attributes for ownership changes that have occurred previously has been performed, resulting in a 
permanent decrease of federal and state NOL carryforwards in the amount of $7.2 million and a permanent decrease in federal research tax credit 
carryforwards in the amount of $0.2 million. As a result of these decreases and others that may occur as a result of future ownership changes, our ability to 
use our pre-change NOL carryforwards and other tax attribute carryforwards to offset U.S. federal taxable income and tax liabilities is limited and may 
become subject to even greater limitations, which could potentially accelerate or permanently increase future federal tax liabilities for us. In addition, there 
may be periods during which the use of state income tax NOL carryforwards and other state tax attribute carryforwards (such as state research tax credits) 
are suspended or otherwise limited, which could potentially accelerate or permanently increase future state tax liabilities for us.
Litigation may substantially increase our costs and harm our business.
We have been, and may in the future become, party to lawsuits including, without limitation, actions, claims and proceedings in the ordinary course 
of business relating to our directors, officers, stockholders, intellectual property, and employment matters and policies, which will cause us to incur legal fees 
and other costs related thereto, including potential expenses for the reimbursement of legal fees of officers and directors under indemnification obligations. 
For example, we have been defending a lawsuit filed in the U.S. District Court for the District of Maryland by the Estate of Henrietta Lacks alleging unjust 
enrichment arising from our receipt and use of HeLa cells. The expense of defending against such claims or litigation may be significant and there can be no 
assurance that we will be successful in any defense. Further, the amount of time that may be required to resolve such claims or lawsuits is unpredictable, and 
these actions may divert management’s attention from the day-to-day operations of our business, which could adversely affect our business, results of 
operations, and cash flows. Litigation is subject to inherent uncertainties, and an adverse result in such matters that may arise from time to time could have a 
material adverse effect on our business, results of operations, and financial condition.
Our business and operations could be negatively affected if we become subject to stockholder activism or hostile bids, which could cause us to incur 
significant expense, hinder execution of our business strategy and impact our stock price.
Stockholder activism, which takes many forms and arises in a variety of situations, has been increasingly prevalent. Stock price declines may also 
increase our vulnerability to unsolicited approaches. If we become the subject of certain forms of stockholder activism, such as proxy contests or hostile bids, 
the attention of our management and our board of directors may be diverted from execution of our strategy. Such stockholder activism could give rise to 
perceived uncertainties as to our future strategy, adversely affect our relationships with business partners and make it more difficult to attract and retain 
qualified personnel. Also, we may incur substantial costs, including significant legal fees and other expenses, related to activist stockholder matters. Our 
stock price could be subject to significant fluctuation or otherwise be adversely affected by the events, risks and uncertainties of any stockholder activism.

 
66
Increased scrutiny regarding ESG practices and disclosures, as well as existing and proposed laws related to these topics, could result in additional costs 
and adversely impact our business and reputation.
Companies across all industries are facing increasing scrutiny relating to their Environmental, Social and Governance, or ESG, practices and disclosures 
and institutional and individual investors are increasingly using ESG screening criteria in making investment decisions. Investors who are focused on ESG 
matters may seek enhanced ESG disclosures or to implement policies adverse to our business, and there can be no assurances that stockholders will not 
advocate, via proxy contests, media campaigns or other public or private means, for us to make corporate governance changes or engage in certain 
corporate actions. Our disclosures on these matters or a failure to satisfy evolving stakeholder expectations for ESG practices and reporting may potentially 
harm our reputation and impact employee retention and access to capital. In addition, our failure, or perceived failure, to pursue or fulfill our goals, targets, 
and objectives or to satisfy various reporting standards within the timelines we announce, or at all, could expose us to government enforcement actions and 
private litigation.
Our ability to achieve any goal or objective, including with respect to environmental and culture initiatives and compliance with ESG reporting 
standards, is subject to numerous risks, many of which are outside of our control. Examples of such risks include the availability and cost of technologies and 
products that meet sustainability and ethical supply chain standards, evolving regulatory requirements affecting ESG standards or disclosures, our ability to 
recruit, develop, and retain talent in our labor markets, and our ability to develop reporting processes and controls that comply with evolving standards for 
identifying, measuring and reporting ESG metrics. As ESG best-practices, reporting standards, and disclosure requirements continue to develop, we may incur 
increasing costs related to maintaining or achieving our ESG goals in addition to ESG monitoring and reporting.
 

 
67
Item 1B. Unresolved Staff Comments 
None. 
Item 1C. Cybersecurity 
In the ordinary course of our business, we collect, use, store, and transmit digitally large amounts of confidential, financial, sensitive, proprietary, 
personal, and health-related information. The secure maintenance of this information and our information technology systems is important to our 
operations and business strategy. To this end, we have implemented processes designed to assess, identify, and manage risks from potential unauthorized 
occurrences on or through our information technology systems that may result in adverse effects on the confidentiality, integrity, and availability of these 
systems and the data residing therein. Our cybersecurity program is informed in part by industry standards and best practices, such as the National Institute 
of Standards and Technology (NIST) Cybersecurity Framework. This program is managed and monitored by a dedicated information technology team, 
including a Senior Director of Information Security, and is led by our Senior Vice President, Chief Information Officer, or CIO. Our processes include 
mechanisms, controls, technologies, and systems designed to prevent or mitigate data loss, theft, misuse, or other security incidents or vulnerabilities 
affecting the data and maintain a stable information technology environment. Our program includes, for example: 
•
Regular penetration and vulnerability testing, data recovery testing, security audits, and ongoing risk assessments; 
•
Engagement of external service providers, where appropriate, to assess, test or otherwise assist with aspects of our security controls as part of 
our operational security model;
•
Cybersecurity awareness training for our employees, contactors, incident response personnel, and senior management;
•
A cybersecurity incident response plan that includes procedures for responding to cybersecurity incidents and annual tabletop exercises with 
participants from cross functional teams;
•
A third-party risk management process for service providers, suppliers, and vendors including due diligence prior to engagement and ongoing 
periodic review of our key technology vendors, and other contractors and suppliers. 
Our CIO, together with our Senior Director of Information Security and other members of the IT leadership team, are responsible for assessing and 
managing cybersecurity risks. Our CIO has over ten years of experience managing information technology and cybersecurity. Our Senior Director of 
Information Security has over 25 years of experience managing information technology and cybersecurity matters and is certified as a Certified Information 
Systems Security Professional (CISSP). We consider cybersecurity, along with other significant risks that we face, within our overall enterprise risk 
management framework. 
Since the beginning of the last fiscal year, we have not identified any risks from known cybersecurity threats, including as a result of any prior 
cybersecurity incidents, that have materially affected us, but we face certain ongoing cybersecurity risks or threats that, if realized, are reasonably likely to 
materially affect us. Additional information on cybersecurity risks we face is discussed in Part I, Item 1A, “Risk Factors,” under the heading “Our business and 
operations may be materially adversely affected in the event of computer system failures or security breaches.” 
The Board of Directors, as a whole and at the committee level, has oversight for the most significant risks facing us and for our processes to identify, 
prioritize, assess, manage, and mitigate those risks. The Audit Committee, which is comprised solely of independent directors, has been designated by our 
Board to oversee cybersecurity risks. The Audit Committee receives regular updates on cybersecurity and information technology matters and related risk 
exposures from our CIO. The Board also receives updates from the Audit Committee on cybersecurity risks on a regular basis. 
Item 2. Properties
Our primary operations are conducted at the leased facilities summarized in the below table. In 2023, we completed the construction of our gene 
therapy manufacturing facility located in Bedford, Massachusetts. We believe our facilities are adequate and suitable for our current needs and that we will 
be able to obtain new or additional leased space in the future when necessary.
Property Location
 
Use
 
Lease Expiration Date
Novato, California
 
Headquarters and office
 
December 2026
Novato, California
 
Laboratory and office
 
October 2028
Brisbane, California
 
Office
 
June 2026
Somerville, Massachusetts
 
Laboratory and office
 
January 2030
Woburn, Massachusetts
 
Laboratory and office
 
April 2028
Woburn, Massachusetts
 
Laboratory and office
 
October 2026
Bedford, Massachusetts
 
Manufacturing facility
 
Owned property
 

 
68
 
Item 3. Legal Proceedings
Ultragenyx Pharmaceutical Inc. and Baylor Research Institute v. Navinta LLC, Aurobindo Pharma Limited, Aurobindo Pharma USA, Inc., Esjay Pharma Private 
Limited and Esjay Pharma LLC
On September 26, 2024, we filed a patent infringement suit under the Hatch-Waxman Act against Navinta, Aurobindo and Esjay in the United States 
District Court for the District of New Jersey. The suit is in response to notices from Navinta, Aurobindo, and Esjay concerning the filing of ANDAs with the 
FDA, seeking FDA approval to market a generic version of Dojolvi® (triheptanoin) along with Paragraph IV certifications which allege that one Orange Book-
listed patent covering Dojolvi is invalid, unenforceable, and/or will not be infringed by the manufacture, use, or sale of the proposed generic product. The 
filing of the suit triggers a stay preventing the FDA from granting the ANDAs final approval, which stay extends to December 30, 2027 (i.e., the date that is 
seven and one-half years from the June 30, 2020 approval of Dojolvi). We intend to vigorously defend our intellectual property. In addition to the issued 
patents for Dojolvi listed in the Orange Book, we own a pending patent application relating to certain pharmaceutical compositions of triheptanoin, including 
Dojolvi, that would be expected to expire in 2034 upon an issuance. Dojolvi is also protected in the U.S. by regulatory exclusivity until 2025 and orphan drug 
exclusivity for the treatment of pediatric and adult patients with molecularly confirmed long-chain fatty acid oxidation disorders (LC-FAOD) until 2027. 
Aurobindo and Navinta answered the complaint on December 2, 2024 and December 30, 2024, respectively. Esjay filed a motion to dismiss the suit on 
December 2, 2024. We filed an opposition to Esjay’s motion to dismiss on January 7, 2025. 
Ultragenyx Pharmaceutical Inc. v. Catalent Maryland, Inc. and Catalent Pharma Solutions LLC 
On October 9, 2024, we filed a suit against Catalent Maryland, Inc. and Catalent Pharma Solutions, LLC (collectively, Catalent) in the Superior Court of 
the State of Delaware alleging that Catalent fraudulently mispresented its manufacturing capabilities and serially breached the terms of its manufacturing 
agreement with us. Our suit seeks monetary damages from Catalent in excess of $100 million.
Catalent filed its response, which included a motion to dismiss the fraud claim alleged in the suit, on December 18, 2024. We filed an amended 
complaint in reply to Catalent’s response on February 3, 2025. 
Except as disclosed above, we are not currently a party to any other material legal proceedings. We may, however, in the ordinary course of business 
face various claims brought by third parties or government regulators and, from time to time, make claims or take legal actions to assert our rights, including 
claims relating to our directors, officers, stockholders, intellectual property rights, employment matters and the safety or efficacy of our products. Any of 
these claims could subject us to costly litigation and, while we generally believe that we have adequate insurance to cover many different types of liabilities, 
our insurance carriers may deny coverage, may be inadequately capitalized to pay on valid claims, or our policy limits may be inadequate to fully satisfy any 
damage awards or settlements. If this were to happen, the payment of any such awards could have a material adverse effect on our consolidated operations, 
cash flows and financial position. Additionally, any such claims, whether or not successful, could damage our reputation and business.
 
Item 4. Mine Safety Disclosures 
Not applicable.

 
69
PART II 
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 
Our common stock has been traded on The Nasdaq Global Select Market since January 31, 2014 under the symbol “RARE”. As of February 13, 2025, 
we had eight holders of record of our common stock. Certain shares are held in “street” name and, accordingly, the number of beneficial owners of such 
shares is not known or included in the foregoing number.
 
STOCK PRICE PERFORMANCE GRAPH
The following stock performance graph compares our total stock return with the total return for (i) the Nasdaq Composite Index and (ii) the Nasdaq 
Biotechnology Index for the period from December 31, 2019 through December 31, 2024. The figures represented below assume an investment of $100 in 
our common stock at the closing price of $42.71 on December 31, 2019 and in the Nasdaq Composite Index, or IXIC, and the Nasdaq Biotechnology Index, or 
NBI, on December 31, 2019 and the reinvestment of dividends into shares of common stock. The comparisons in the table are required by the SEC and are 
not intended to forecast or be indicative of the possible future performance of our common stock. This graph shall not be deemed “soliciting material” or be 
deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liabilities 
under that section, and shall not be deemed to be incorporated by reference into any of our filings under the Securities Act of 1933, as amended, or the 
Securities Act, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.
 
 
$100 Investment in Stock 
or Index
 
Ticker
 
December 
31, 2019
   
December 
31, 2020
   
December 
31, 2021
   
December 31, 
2022
   
December 31, 
2023
   
December 31, 
2024
   
Ultragenyx 
Pharmaceutical Inc.
 
RARE
  $
100.00     $
324.12     $
196.89     $
108.48     $
111.96     $
98.50    
NASDAQ Composite Index  
^IXIC
  $
100.00     $
143.64     $
174.36     $
116.65     $
167.30     $
215.22    
NASDAQ Biotechnology 
Index
 
^NBI
  $
100.00     $
125.69     $
124.89     $
111.27     $
115.42     $
113.84    
Dividend Policy 
We have never declared or paid cash dividends on our common stock. We currently intend to retain all available funds and any future earnings, if any, 
to fund the development, operation, and expansion of our business, and we do not anticipate paying any cash dividends on our common stock in the 
foreseeable future. Any future determination to pay dividends will be made at the discretion of our board of directors or any authorized committee thereof. 
Unregistered Sales of Equity Securities
None.
Issuer’s Purchases of Equity Securities 

 
70
None. 
Item 6. Reserved 

 
71
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations 
MANAGEMENT’S DISCUSSION AND ANALYSIS OF 
FINANCIAL CONDITION AND RESULTS OF OPERATIONS 
You should read the following discussion and analysis of our financial condition and results of operations together with our Consolidated Financial 
Statements and related notes included elsewhere in this Annual Report.
This discussion and analysis generally covers our financial condition and results of operations for the year ended December 31, 2024, including year-
over-year comparisons versus the year ended December 31, 2023. Our Annual Report on Form 10-K for the year ended December 31, 2023 includes a 
discussion and analysis of our financial condition and results of operations for the year ended December 31, 2022 in "Part II, Item 7. Management’s Discussion 
and Analysis of Financial Condition and Results of Operations.”
Overview 
Ultragenyx Pharmaceutical Inc., we or the Company, is a biopharmaceutical company committed to bringing novel products to patients for the 
treatment of serious rare and ultrarare genetic diseases. We have built a diverse portfolio of approved therapies and product candidates aimed at addressing 
diseases with high unmet medical need and clear biology for treatment, for which there are typically no approved therapies treating the underlying disease. 
Our strategy is predicated upon time- and cost-efficient drug development, with the goal of delivering safe and effective therapies to patients with the 
utmost urgency.
Approved Therapies and Clinical Product Candidates
Our current approved therapies and clinical-stage pipeline consist of four product categories: biologics, small molecules, AAV gene therapy, and 
nucleic acid product candidates. We have four commercially approved products, consisting of Crysvita® (burosumab) for the treatment of X-linked 
hypophosphatemia, or XLH, and tumor-induced osteomalacia, or TIO, Mepsevii® (vestronidase alfa) for the treatment of mucopolysaccharidosis VII, or 
MPSVII or Sly Syndrome, Dojolvi® (triheptanoin) for the treatment of long-chain fatty acid oxidation disorders, or LC-FAOD, and Evkeeza® (evinacumab) for 
the treatment of homozygous familial hypercholesterolemia, or HoFH. Please see “Item 1. Business” above for a description of our approved products and 
our clinical stage pipeline products.
Financial Operations Overview 
We are a biopharmaceutical company with a limited operating history. To date, we have invested substantially all of our efforts and financial 
resources in identifying, acquiring, and developing our products and product candidates, including conducting clinical studies and providing selling, general 
and administrative support for these operations. To date, we have funded our operations primarily from the sale of our equity securities, revenues from our 
commercial products, the sale of certain future royalties, and strategic collaboration arrangements.
We have incurred net losses in each year since inception. Our net losses were $569.2 million and $606.6 million for the years ended December 31, 
2024 and 2023, respectively. Substantially all of our net losses have resulted from costs incurred in connection with our research and development programs 
and from selling, general and administrative costs associated with our operations.
For the year ended December 31, 2024, our total revenues increased to $560.2 million, compared to $434.2 million for the same period in 2023. The 
increase in revenue was driven by higher demand for our approved products. 
As of December 31, 2024, we had $745.0 million in available cash, cash equivalents and marketable debt securities.
Critical Accounting Policies and Significant Judgments and Estimates 
Our management’s discussion and analysis of our financial condition and results of operations is based on our Consolidated Financial Statements, 
which have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The preparation of these Consolidated Financial 
Statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets 
and liabilities at the date of the financial statements, as well as the reported expenses incurred during the reporting periods. Our estimates are based on our 
historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making 
judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates 
under different assumptions or conditions. We periodically review our estimates as a result of changes in circumstances, facts and experience. The effects of 
material revisions in estimates are reflected in the financial statements prospectively from the date of the change in estimate. Our significant accounting 
policies are more fully described in “Note 2. Summary of Significant Accounting Policies” to our financial statements included elsewhere in this Annual 
Report.

 
72
We define our critical accounting policies as those GAAP accounting principles that require us to make subjective estimates and judgments about 
matters that are uncertain and are likely to have a material impact on our financial condition and results of operations as well as the specific manner in which 
we apply those principles. We believe the critical accounting policies used in the preparation of our financial statements that require significant estimates 
and judgments are as follows:
Accrued Research and Development, and Research and Development Expenses 
As part of the process of preparing consolidated financial statements, we are required to estimate and accrue expenses, the largest of which is related 
to accrued research and development expenses. This process involves reviewing contracts and purchase orders, identifying services that have been 
performed on our behalf, and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced 
or otherwise notified of the actual costs. 
We record accruals for estimated costs of research, preclinical and clinical studies, and manufacturing development. These costs are a significant 
component of our research and development expenses. A substantial portion of our ongoing research and development activities is conducted by third-party 
service providers. We accrue the costs incurred under our agreements with these third parties based on actual work completed in accordance with 
agreements established with these third parties. We determine the actual costs through discussions with internal personnel and external service providers as 
to the progress or stage of completion of the services and the agreed-upon fee to be paid for such services. We make judgments and estimates in 
determining the accrual balance in each reporting period. As actual costs become known, we adjust our accruals. Although we do not expect our estimates to 
be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and 
timing of services performed may vary and could result in us reporting amounts that are too high or too low in any particular period. Our accrual is 
dependent, in part, upon the receipt of timely and accurate reporting from clinical research organizations and other third-party vendors. 
Research and development costs are expensed as incurred and consist of salaries and benefits, stock-based compensation, lab supplies, materials and 
facility costs, as well as fees paid to other nonemployees and entities that conduct certain research and development activities on our behalf. Amounts 
incurred in connection with collaboration and license agreements are also included in research and development expense. Payments made prior to the 
receipt of goods or services to be used in research and development are capitalized until the goods or services are received.
To date, there have been no material differences from our accrued estimated expenses to the actual clinical trial expenses; however, due to the 
nature of estimates, we cannot assure you that we will not make changes to our estimates in the future as we become aware of additional information about 
the status or conduct of our clinical studies and other research activities.
Revenue Recognition
Product Sales
We sell our approved products through a limited number of distributors. Under Accounting Standards Codification, or ASC, 606, Revenue from 
Contracts with Customers, revenue from product sales is recognized at the point in time when control is transferred to these distributors. We also recognize 
revenue from sales of certain products on a “named patient” basis, which are allowed in certain countries prior to the commercial approval of the product. 
Prior to recognizing revenue, we make estimates of the transaction price, including any variable consideration that is subject to a constraint. Amounts of 
variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of cumulative revenue 
recognized will not occur and when the uncertainty associated with the variable consideration is subsequently resolved. Product sales are recorded net of 
estimated government-mandated rebates and chargebacks, estimated product returns, and other deductions.
Provisions for returns and other adjustments are provided for in the period the related revenue is recorded, as estimated by management. These 
reserves are based on estimates of the amounts earned or to be claimed on the related sales and are reviewed periodically and adjusted as necessary. Our 
estimates of government mandated rebates, chargebacks, estimated product returns, and other deductions depends on the identification of key customer 
contract terms and conditions, negotiated pricing, as well as estimates of sales volumes to different classes of payors. If actual results vary, we may need to 
adjust these estimates, which could have a material effect on earnings in the period of the adjustment.
Collaboration, License and Royalty Revenue
We have certain license and collaboration agreements that are within the scope of ASC 808, Collaborative Agreements, which provides guidance on 
the presentation and disclosure of collaborative arrangements. Generally, the classification of the transactions under the collaborative arrangements is 
determined based on the nature of contractual terms of the arrangement, along with the nature of the operations of the participants. We record our share 
of collaboration revenue, net of transfer pricing related to net sales in the period in which such sales occur, if we are considered as an agent in the 
arrangement. We are considered an agent when 

 
73
the collaboration partner controls the product before transfer to the customers and has the ability to direct the use of and obtain substantially all of the 
remaining benefits from the product. Funding received related to research and development services and commercialization costs is generally classified as a 
reduction of research and development expenses and selling, general and administrative expenses, respectively, in the Consolidated Statement of 
Operations, because the provision of such services for collaborative partners are not considered to be part of our ongoing major or central operations.
We also record royalty revenues under certain of our license or collaboration agreements in exchange for license of intellectual property.
We utilize certain information from our collaboration partners to record collaboration revenue, including revenue from the sale of the product, 
associated reserves on revenue, and costs incurred for development and sales activities. For the periods covered in the financial statements presented, there 
have been no material changes to prior period estimates of revenues and expenses. 
We sold the right to receive certain royalty payments from net sales of Crysvita in certain territories to RPI Finance Trust, or RPI, an affiliate of Royalty 
Pharma, and to OCM LS23 Holdings LP, an investment vehicle for Ontario Municipal Employees Retirement System, or OMERS, as further described in 
“Liabilities for Sales of Future Royalties” below.
We record the royalty revenue from the net sales of Crysvita in the applicable territories on a prospective basis as non-cash royalty revenue in the 
Consolidated Statements of Operations over the term of the applicable arrangement.
The terms of our collaboration and license agreements may contain multiple performance obligations, which may include licenses and research and 
development activities. We evaluate these agreements under ASC 606, Revenue from Contracts with Customers, to determine the distinct performance 
obligations. We analogize to ASC 606 for the accounting for distinct performance obligations for which there is a customer relationship. Prior to recognizing 
revenue, we make estimates of the transaction price, including variable consideration that is subject to a constraint. Amounts of variable consideration are 
included in the transaction price to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur and 
when the uncertainty associated with the variable consideration is subsequently resolved. Total consideration may include nonrefundable upfront license 
fees, payments for research and development activities, reimbursement of certain third-party costs, payments based upon the achievement of specified 
milestones, and royalty payments based on product sales derived from the collaboration.
If there are multiple distinct performance obligations, we allocate the transaction price to each distinct performance obligation based on our relative 
standalone selling price. The standalone selling price is generally determined based on the prices charged to customers or using expected cost-plus margin. 
We estimate the efforts needed to complete the performance obligations and recognize revenue by measuring the progress towards complete satisfaction of 
the performance obligations using input measures.
Inventory
We expense costs associated with the manufacture of our products prior to regulatory approval. Typically, capitalization of such costs begins when we 
have received the regulatory approval of the product. Prior to the approval of our products by the U.S. Food and Drug Administration, or FDA, manufacturing 
and related costs are expensed. As of December 31, 2024, we do not hold a material amount of previously expensed inventory for our approved products.
Inventory that is manufactured after regulatory approval is valued at the lower of cost and net realizable value and cost is determined using the 
average-cost method. 
We periodically review our inventories for excess amounts or obsolescence and write down obsolete or otherwise unmarketable inventory to the 
estimated net realizable value.
Liabilities for Sales of Future Royalties
In December 2019, we entered into a Royalty Purchase Agreement with RPI. Pursuant to the agreement, RPI paid us $320.0 million in consideration 
for our right to receive royalty payments on the net sales of Crysvita in the European Union, or the EU, the UK, and Switzerland, effective January 1, 2020, 
under the terms of our Collaboration and License Agreement with Kyowa Kirin Co., Ltd., or KKC. The agreement with RPI will automatically terminate, and the 
payment of royalties to RPI will cease, in the event aggregate royalty payments received by RPI are equal to or greater than the capped amount of $608.0 
million prior to December 31, 2030, or in the event aggregate royalty payments received by RPI are less than $608.0 million prior to December 31, 2030, 
when aggregate royalty payments received by RPI are equal to $800.0 million.
In July 2022, we entered into a Royalty Purchase Agreement with OMERS. Pursuant to the agreement, OMERS paid $500.0 million to us in 
consideration for the right to receive 30% of the future royalty payments due to us from KKC based on net sales of Crysvita in the U.S. and Canada under the 
terms of the KKC Collaboration Agreement. The calculation of royalty payments to OMERS 

 
74
is based on net sales of Crysvita beginning in April 2023 and continuing until expiration, which is the earlier of the date on which aggregate payments 
received by OMERS equals $725.0 million or the date the final royalty payment is made to us under the KKC Collaboration Agreement. Proceeds from these 
transactions were recorded as liabilities (specifically, liabilities for sales of future royalties on the Consolidated Balance Sheets). We are amortizing $320.0 
million and $500.0 million, net of transaction costs of $5.8 million and $9.1 million for RPI and OMERS, respectively. 
We record the royalty revenue arising from the net sales of Crysvita in the applicable territories as non-cash royalty revenue in the Consolidated 
Statements of Operations over the term of the arrangements. Our effective annual interest rates were 6.2% and 7.5%, for RPI and OMERS, respectively, as of 
December 31, 2024.
There are a number of factors that could materially affect the amount and timing of royalty payments from KKC in the applicable territories, most of 
which are not within our control. Such factors include, but are not limited to, the success of KKC’s sales and promotion of Crysvita, changing standards of 
care, macroeconomic and inflationary pressures, the introduction of competing products, pricing for reimbursement in various territories, manufacturing or 
other delays, intellectual property matters, adverse events that result in governmental health authority imposed restrictions on the use of Crysvita, 
significant changes in foreign exchange rates as the royalty payments are made in U.S. dollars, or USD, while significant portions of the underlying sales of 
Crysvita are made in currencies other than USD, and other events or circumstances that could result in reduced royalty payments from sales of Crysvita, all of 
which would result in a reduction of non-cash royalty revenue and the non-cash interest expense over the life of the arrangement. Conversely, if sales of 
Crysvita in the relevant territories are more than expected, the non-cash royalty revenue and the non-cash interest expense recorded by us would be greater 
over the term of the arrangements.
Stock-Based Compensation 
Stock-based compensation costs related to equity awards granted to employees are measured at the date of grant based on the estimated fair value 
of the award, net of estimated forfeitures. We estimate the grant date fair value of options, and the resulting stock-based compensation expense, using the 
Black-Scholes option-pricing model. The grant date fair value of the stock-based awards is recognized on a straight-line basis over the requisite service 
period, which is generally the vesting period of the respective awards. We expect to continue to grant equity awards in the future, and to the extent that we 
do, our actual stock-based compensation expense will likely increase. The Black-Scholes option-pricing model requires the use of certain subjective 
assumptions which determine the estimated fair value of stock-based awards. 
•
Expected Term — The expected term represents the period that the stock-based awards are expected to be outstanding and is determined using 
the simplified method (based on the midpoint between the vesting date and the end of the contractual term). 
•
Expected Volatility— The expected volatility is based on historical volatility over the look-back period corresponding to the expected term.
Strike price for options, including performance stock options, or PSOs, is equal to the closing market value of our common stock on the date of grant. 
In addition to the assumptions used in the Black-Scholes option-pricing model, we also estimate a forfeiture rate to calculate the stock-based 
compensation for our awards. We will continue to use judgment in evaluating the expected volatility, expected terms, and forfeiture rates utilized for our 
stock-based compensation calculations on a prospective basis and will revise in subsequent periods, if actual forfeitures differ from those estimates. 
For restricted stock units, or RSUs, and performance stock units, or PSUs, the fair value is based on the market value of our common stock on the date 
of grant, except for certain PSUs with a market vesting condition, for which fair value is estimated using a Monte Carlo simulation model. Stock-based 
compensation expense for RSUs is recognized on a straight-line basis over the requisite service period. PSUs are subject to vest only if certain specified 
criteria are achieved and the employees’ continued service with the Company. For certain PSUs, the number of PSUs that may vest are also subject to the 
achievement of certain specified criteria, including both performance conditions and market conditions. Compensation expense for PSUs is recognized only 
after the achievement of the specified criteria is considered probable and recognized on a straight-line basis between the grant date and the expected vest 
date, with a catch-up for previously unrecognized expense, if any, recognized in the period the achievement criteria is deemed probable.
For the years ended December 31, 2024, 2023, and 2022, stock-based compensation expense was $158.1 million, $135.2 million, and $130.4 million, 
respectively. As of December 31, 2024, we had $256.8 million of total unrecognized stock-based compensation costs, net of estimated forfeitures, which we 
expect to recognize over a weighted-average period of 2 years. 

 
75
Income Taxes
We use the liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the 
differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in 
effect when the differences are expected to reverse. We assess the likelihood that the resulting deferred tax assets will be realized. A valuation allowance is 
provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized.
We recognize benefits of uncertain tax positions if it is more likely than not that such positions will be sustained upon examination based solely on 
their technical merits, as the largest amount of benefit that is more likely than not to be realized upon the ultimate settlement. Our policy is to recognize 
interest and penalties related to the underpayment of income taxes as a component of income tax expense or benefit. To date, there have been no interest 
or penalties charged in relation to the unrecognized tax benefits.
As of December 31, 2024, our total gross deferred tax assets were $1,213.7 million. Due to our lack of earnings history and uncertainties surrounding 
our ability to generate future taxable income, the net deferred tax assets have been fully offset by a valuation allowance. The deferred tax assets were 
primarily comprised of federal and state tax net operating losses and tax credit carryforwards. Utilization of the net operating loss and tax credit 
carryforwards may be subject to an annual limitation due to historical or future ownership percentage change rules provided by the Internal Revenue Code 
of 1986, and similar state provisions. The annual limitation may result in the expiration of certain net operating loss and tax credit carryforwards before their 
utilization.
Results of Operations 
Comparison of Years Ended December 31, 2024 and 2023
Revenues (dollars in thousands)
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Product sales:
 
   
 
   
     
 
Crysvita
$
134,709     $
75,697     $
59,012    
78%
Dojolvi
 
88,194      
70,633      
17,561    
25%
Evkeeza
 
32,162      
3,642      
28,520    
*
Mepsevii
 
30,350      
30,441      
(91 )  
0%
Total product sales
 
285,415      
180,413      
105,002    
58%
Crysvita royalty revenue
 
274,815      
182,652      
92,163    
50%
Collaboration and license revenue:
 
   
 
   
 
   
 
Crysvita collaboration revenue in Profit-Share 
    Territory
 
—      
69,705      
(69,705 )  
*
Other
 
—      
1,479      
(1,479 )  
*
Total collaboration and license revenue
 
—      
71,184      
(71,184 )  
*
Total revenues
$
560,230     $
434,249     $
125,981    
29%
* not meaningful
 
     
     
     
Our product sales increased $105.0 million for the year ended December 31, 2024, compared to the same period in 2023. The increase was primarily 
due to an increase in demand for Crysvita in Latin America resulting from an increase in the number of patients on therapy, ongoing launch of Evkeeza in 
Japan and in Europe, Middle East and Africa territories, or EMEA, and continued increase in demand for our other approved products.
Our Crysvita royalty revenue and collaboration revenue in the Profit-Share Territory increased by a net $22.5 million for the year ended December 31, 
2024, compared to the same period in 2023; this increase in Crysvita revenue is primarily due to an increase in the number of patients on therapy. We 
transitioned commercial responsibilities to KKC in the Profit-Share Territory in April 2023. Post transition, we recognize our revenue share for Crysvita sales in 
the Profit-Share Territory as royalty revenue, which was recorded as collaboration revenue prior to the transition.
Other revenue decreased by $1.5 million for the year ended December 31, 2024, compared to the same period in 2023. The decrease was due to the 
completion of the technology transfer and the technology transfer period related to the Daiichi Sankyo agreement as of March 31, 2023.

 
76
Cost of Sales (dollars in thousands) 
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Cost of sales
$
76,728     $
45,209     $
31,519    
70%
Cost of sales increased by $31.5 million for the year ended December 31, 2024, compared to the same period in 2023. The increase in cost of sales 
was due to an increase in demand for our approved products, primarily Crysvita in Latin America and Evkeeza in EMEA and Japan.
Research and Development Expenses (dollars in thousands)
Research and development expenses include internal and external costs incurred for research and development of our programs and program 
candidates and expenses related to certain technology that we acquire or license through business development transactions. These expenses consist 
primarily of clinical studies performed by contract research organizations, manufacturing of drug substance and drug product performed by contract 
manufacturing organizations and at our gene therapy manufacturing facility, materials and supplies, fees from collaborative and other arrangements 
including milestones, licenses and other fees, personnel costs including salaries, benefits and stock-based compensation, and overhead allocations consisting 
of various support and infrastructure costs. 
Clinical programs include study conduct and manufacturing costs related to clinical program candidates. Translational research includes costs for 
preclinical study work and costs related to preclinical programs prior to IND filing. Upfront license, acquisition, and milestone fees include any significant 
expenses related to strategic licensing agreements. Approved products include costs for disease monitoring programs for post-marketing clinical studies, 
medical affairs activities to support scientific discovery efforts on existing programs, and regulatory costs for unapproved regions. Infrastructure costs include 
direct costs related to laboratory, IT, and equipment depreciation costs, and overhead allocations for human resources, IT, and other allocable costs.
We manage our research and development expenses by identifying the research and development activities we expect to be performed during a 
given period and then prioritizing efforts based on anticipated probability of successful technical development and regulatory approval, market potential, 
available human and capital resources, scientific data and other considerations. We regularly review our research and development activities based on 
unmet medical need and, as necessary, reallocate resources among our research and development portfolio that we believe will best support the long-term 
growth of our business. We allocate and analyze certain operational expenses by individual product candidates, specifically costs to conduct clinical studies, 
including expenses incurred with clinical research organizations, direct manufacturing costs, and salaries and benefits. Other operational expenses are not 
allocated and analyzed by individual product candidates. For instance, costs associated with Chemistry, Manufacturing and Controls, or CMC costs, are 
primarily purchases of materials for our internal gene therapy manufacturing activities that qualify as research and development expenses at the time of 
purchase but for which the allocation and consumption of such costs by a specific product candidate is not determined; accordingly, CMC costs for gene 
therapy programs are generally spread across multiple product candidates. Although we do track and allocate certain operational R&D costs at the individual 
product candidate level, as described above and as reflected in the table below, we do not fully track and allocate research and development expenses at the 
individual product candidate level.
The following table provides a breakout of our research and development expenses by individual product candidate under each major clinical 
program type and other research and development categories:

 
77
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Clinical programs:
    
    
     
 
Gene therapy programs
    
    
    
 
DTX301
$
40,831     $
31,439     $
9,392    
30%
DTX401
 
75,340      
72,103      
3,237    
4%
UX701
 
33,207      
24,079      
9,128    
38%
UX111
 
41,323      
24,412      
16,911    
69%
CMC costs
 
3,459      
16,672      
(13,213 )  
-79%
Total gene therapy programs
 
194,160      
168,705      
25,455    
15%
Biologic and nucleic acid programs
     
     
     
 
GTX102
 
50,757      
31,121      
19,636    
63%
UX053
 
374      
12,821      
(12,447 )  
-97%
UX143
 
89,118      
64,972      
24,146    
37%
Total biologic and nucleic acid programs
 
140,249      
108,914      
31,335    
29%
Translational research
 
45,702      
71,820      
(26,118 )  
-36%
Upfront license, acquisition, and milestone fees
 
30,450      
9,000      
21,450    
238%
Approved products
 
35,432      
53,478      
(18,046 )  
-34%
Infrastructure
 
81,034      
78,929      
2,105    
3%
Stock-based compensation
 
86,616      
74,531      
12,085    
16%
Other research and development
 
84,222      
83,072      
1,150    
1%
Total research and development expenses
$
697,865     $
648,449     $
49,416    
8%
Total research and development expenses increased $49.4 million for the year ended December 31, 2024 compared to the same period in 2023. The 
change in research and development expenses was due to: 
•
for gene therapy programs, an increase of $25.5 million, primarily related to BLA filing activities for UX111, and continued clinical progress of the 
other programs, combined with the transition of certain programs to in-house manufacturing which resulted in a decrease in CMC costs and an 
increase in internal manufacturing costs;
•
for biologic and nucleic acid programs, an increase of $31.3 million, primarily related to the continued clinical progress of the UX143 and GTX102 
programs and associated clinical development and manufacturing expenses, partially offset by a reduction in development expense on UX053 for 
the treatment of Glycogen Storage Disease Type III due to cessation of development activities for the program;
•
for translational research, a decrease of $26.1 million, primarily related to decreases in manufacturing and headcount expense for early stage 
and IND-stage projects;
•
for upfront license, acquisition, and milestone fees, an increase of $21.5 million, primarily related to the achievement of a clinical enrollment 
milestone on the GTX-102 program during 2024;
•
for approved products, a decrease of $18.0 million, primarily due to reduced reimbursement of Regeneron collaboration expenses with the 
completion of the pediatric and open label extension trials for Evkeeza and reduced operating expenses for Crysvita post-marketing studies;
•
for infrastructure, an increase of $2.1 million, primarily related to depreciation of the gene therapy manufacturing facility, depreciation of 
laboratory-related leasehold improvements and equipment, and IT-related expenses;
•
for stock-based compensation an increase of $12.1 million, primarily related to the increase in total value of stock-based awards granted to 
employees; and
•
for other research and development expenses, an increase of $1.2 million, primarily related to increased staffing to support internal 
manufacturing, and administrative and general support.
We expect our annual research and development expenses to moderate in the future as we advance our product candidates through clinical 
development. The timing and amount of expenses incurred will depend largely upon the outcomes of current or future clinical studies for our product 
candidates as well as the related regulatory requirements, manufacturing costs, and any costs associated with the advancement of our preclinical programs.

 
78
Selling, General and Administrative Expenses (dollars in thousands)
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Selling, general and administrative
$
321,610     $
309,799     $
11,811    
4%
Selling, general and administrative expenses increased $11.8 million for the year ended December 31, 2024, compared to the same period in 2023. 
We expect annual selling, general and administrative expenses to increase in the future as we continue to support our existing approved products, 
multiple clinical-stage product candidates, and planned launches of additional products.
Interest Income (dollars in thousands) 
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Interest income
$
36,506     $
26,688     $
9,818    
37%
 
Interest income increased $9.8 million for the year ended December 31, 2024 compared to the same period in 2023, primarily due to higher 
marketable debt securities balances.
Change in Fair Value of Equity Investments (dollars in thousands)
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Change in fair value of equity investments
$
(1,115 )   $
397     $
(1,512 )  
(381%)
For the years ended December 31, 2024 and 2023, we recorded a net decrease of $1.1 million and a net increase of $0.4 million, respectively, in the 
fair value of our equity investments due to unrealized loss and gain, respectively, on our investment in Solid Biosciences Inc., or Solid, common stock.
Non-cash Interest Expense on Liabilities for Sales of Future Royalties (dollars in thousands)
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Non-cash interest expense on liabilities for
    sales of future royalties
$
63,041     $
66,004     $
(2,963 )  
(4%)
The non-cash interest expense on liabilities for sales of future royalties decreased by $3.0 million for the year ended December 31, 2024, compared to 
the same period in 2023, primarily due to a reduction in total royalty obligation balances as a result of increased royalties generated from our collaboration 
partner, KKC. To the extent the royalty payments are greater or less than our initial estimates or the timing of such payments is materially different than our 
original estimates, we prospectively adjust the effective interest rate.
Other Expense (dollars in thousands)
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
Other expense
$
(3,963 )   $
(337 )   $
(3,626 )  
*
Other expense increased $3.6 million for the year ended December 31, 2024, compared to the same period in 2023. These changes were primarily 
due to fluctuations in foreign exchange rates.
(Provision for) Benefit from Income Taxes (dollars in thousands)
 
Year Ended December 31,
   
Dollar
   
Percent
 
2024
   
2023
   
Change
   
Change
(Provision for) benefit from income taxes
$
(1,597 )   $
1,825     $
(3,422 )  
(188%)
For the year ended December 31, 2024, we recognized an income tax provision of $1.6 million attributable to income tax expense of $0.2 million for 
state tax, and income tax expense of $1.4 million from foreign jurisdictions. For the year ended December 31, 2023, we recognized an income tax benefit of 
$4.8 million attributable to modifications in our state apportionment 

 
79
methodology. We realized no benefit for 2023 losses due to a full valuation allowance against the U.S. net deferred tax assets. The benefit was offset by an 
income tax expense of $3.0 million from foreign jurisdictions.
Liquidity and Capital Resources 
To date, we have funded our operations primarily from the sale of our equity securities, revenue from our commercial products, the sale of certain 
future royalties, and strategic collaboration arrangements. 
As of December 31, 2024, we had $745.0 million in available cash, cash equivalents, and marketable debt securities. We believe that our existing 
capital resources will be sufficient to fund our projected operating requirements for at least the next 12 months. Our cash, cash equivalents, and marketable 
debt securities are held in a variety of deposit accounts, interest-bearing accounts, corporate bond securities, commercial paper, U.S. government securities, 
asset-backed securities, and money market funds. Cash in excess of immediate requirements is invested with a view toward liquidity and capital 
preservation, and we seek to minimize the potential effects of concentration and credit risk.
In June 2024, we completed an underwritten public offering in which 8,782,051 shares of common stock were sold, including the exercise in full by the 
underwriters of their option to purchase an additional 1,346,153 shares, at a public offering price of $39.00 per share. In connection with the offering, we 
sold to certain investors pre-funded warrants, in lieu of common stock, to purchase 1,538,501 shares of common stock at a purchase price of $38.999 per 
pre-funded warrant, which equals the public offering price per share of common stock less the $0.001 exercise price per share of each pre-funded warrant. 
The total proceeds that we received from the offering were $381.0 million, net of underwriting discounts and commissions.
As of December 31, 2024, none of the pre-funded warrants had been exercised.
In February 2024, we entered into a Sales Agreement with Cowen and Company, LLC, or Cowen, pursuant to which the Company may offer and sell 
shares of the Company’s common stock having an aggregate offering proceeds up to $350.0 million, from time to time, in ATM offerings through Cowen. No 
shares were sold under this agreement during the year ended December 31, 2024.
The following table summarizes our cash flows for the periods indicated (in thousands):
 
 
 
Year Ended December 31,
 
 
2024
   
2023
   
Cash used in operating activities
 
$
(414,188 )  $
(474,806 ) 
Cash (used in) provided by investing activities
 
 
(17,768 )   
168,000    
Cash provided by financing activities
 
 
399,241      
388,142    
Effect of exchange rate changes on cash
 
 
(2,525 )   
462    
Net (decrease) increase in cash, cash equivalents, and 
   restricted cash
 
$
(35,240 )  $
81,798    
Cash Used in Operating Activities 
Our primary use of cash is to fund operating expenses, which consist primarily of research and development and commercial expenditures. Due to our 
significant research and development expenditures, we have generated significant operating losses since our inception. Cash used to fund operating 
expenses is affected by the timing of when we pay these expenses, as reflected in the change in our outstanding accounts payable and accrued expenses.
Cash used in operating activities for the year ended December 31, 2024 was $414.2 million and primarily reflected a net loss of $569.2 million, 
partially offset by non-cash items of $141.1 million, net, which consisted primarily of non-cash collaboration royalty revenues, interest expense related to the 
sale of future royalties to RPI and OMERS, stock-based compensation, amortization of discounts on marketable debt securities, and depreciation and 
amortization. The change in operating assets and liabilities also reflected a net increase of cash of $13.9 million, primarily due to an increase in accounts 
payable, accrued, and other liabilities, primarily related to an increase in accrued collaboration and higher revenue reserves from increased sales of our 
approved products, combined with an increase in inventory, primarily for Mepsevii and Evkeeza, partially offset by a decrease in prepaid expenses and other 
assets, primarily in prepaid manufacturing.

 
80
Cash used in operating activities for the year ended December 31, 2023 was $474.8 million and primarily reflected a net loss of $606.6 million, 
partially offset by non-cash items of $146.9 million, net, which consisted primarily of non-cash collaboration royalty revenues, interest expense related to the 
sale of future royalties to RPI and OMERS, net of amounts capitalized, stock-based compensation, amortization of discounts on marketable debt securities, 
and depreciation and amortization. The change in operating assets and liabilities also reflected a net use of cash of $15.1 million, primarily due to an increase 
in accounts receivable primarily related to an increase in sales of our approved products, partially offset by a net decrease in prepaid expenses and other 
assets, primarily in prepaid manufacturing.
Cash (Used in) Provided by Investing Activities 
Cash used in investing activities for the year ended December 31, 2024 was $17.8 million and was primarily related to $12.5 million in payments for 
intangible assets related to milestones on our commercial products, partially offset by $4.7 million from net activities in marketable debt securities.
Cash provided by investing activities for the year ended December 31, 2023 was $168.0 million and was primarily related to $219.8 million from net 
activities in marketable debt securities, offset by purchases of property, plant, and equipment of $44.3 million, primarily related to the fit-out of our gene 
therapy manufacturing facility.
Cash Provided by Financing Activities 
Cash provided by financing activities for the year ended December 31, 2024 was $399.2 million and was primarily comprised of $381.0 million in net 
proceeds from the sale of common stock in our June 2024 underwritten public offering and $11.3 million in proceeds from the issuance of common stock 
from exercise of warrants and equity plan awards, net.
Cash provided by financing activities for the year ended December 31, 2023 was $388.1 million and was primarily comprised of $326.5 million in net 
proceeds from the sale of common stock in our October 2023 underwritten public offering and $53.3 million in net proceeds from the issuance of common 
stock from our ATM.
Funding Requirements 
We anticipate that, excluding non-recurring items, we will continue to generate annual losses in the near term as we continue the development of, 
and seek regulatory approvals for, our product candidates, and continue with commercialization of approved products. We may require additional capital to 
fund our operations, to complete our ongoing and planned clinical studies, to commercialize our products, to continue investing in early-stage research 
capabilities to promote our pipeline growth, to continue to acquire or invest in businesses or products that complement or expand our business, including 
future milestone payments thereunder, and to further develop our general infrastructure and such funding may not be available to us on acceptable terms or 
at all.
If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may be required to delay, limit, reduce the scope of, 
or terminate one or more of our clinical studies, research and development programs, future commercialization efforts, or grant rights to develop and 
market product candidates that we would otherwise prefer to develop and market ourselves.
Our future funding requirements will depend on many factors, including the following:
•
the scope, rate of progress, results and cost of our clinical studies, nonclinical testing, and other related activities; 
•
the cost of manufacturing clinical supplies, and establishing commercial supplies, of our product candidates, products that we have begun to 
commercialize, and any products that we may develop in the future;
•
the cost of operating our GMP gene therapy manufacturing facility;
•
the number and characteristics of product candidates that we pursue; 
•
the cost, timing, and outcomes of regulatory interactions and approvals; 
•
the cost and timing of establishing our commercial infrastructure, and distribution capabilities; 
•
the impact of macroeconomic conditions, including general economic slowdowns, changing interest rates and inflation on our business 
operations and operating results; and
•
the terms and timing of any collaborative, licensing, marketing, distribution, acquisition and other arrangements that we may establish, including 
any required upfront milestone, royalty, reimbursements or other payments thereunder.

 
81
We expect to satisfy future cash needs through existing capital balances, revenue from our commercial products, and a combination of public or 
private equity offerings, debt financings, collaborations, strategic alliances, licensing arrangements, and other marketing and distribution arrangements. 
Please see “Risk Factors—Risks Related to Our Financial Condition and Capital Requirements.”
Contractual Obligations and Commitments
Material contractual obligations arising in the normal course of business primarily consist of operating and finance leases and manufacturing and 
service contract obligations. See "Note 10. Leases" to the Consolidated Financial Statements for amounts outstanding for operating and finance leases as of 
December 31, 2024.
Manufacturing and service contract obligations primarily relate to manufacturing of inventory for our approved products, the majority of which are 
due in the next 12 months. See "Note 16. Commitments and Contingencies" to the Consolidated Financial Statements for these contractual obligations.
The terms of certain of our licenses, royalties, development and collaboration agreements, as well as other research and development activities, 
require us to pay potential future milestone payments based on product development success. The amount and timing of such obligations are unknown or 
uncertain. These potential obligations are further described in "Note 9. License and Research Agreements" to the Consolidated Financial Statements.
Recent Accounting Pronouncements 
In November 2024, the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 
220-40): Disaggregation of Income Statement Expenses, requiring public entities to disclose additional information about specific expense categories in the 
notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim 
periods beginning after December 15, 2027, with early adoption permitted. We are currently evaluating the impact of adopting ASU 2024-03.
In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, requiring public 
entities to disclose information about their reportable segments’ significant expenses and other segment items on an interim and annual basis. Public entities 
with a single reportable segment are required to apply the disclosure requirements in ASU 2023-07, as well as all existing segment disclosures and 
reconciliation requirements in ASC 280 on an interim and annual basis. We adopted ASU 2023-07 during the year ended December 31, 2024.
Item 7A. Quantitative and Qualitative Disclosures about Market Risk 
Interest Rate Risk
Our exposure to market risk for changes in interest rates relates primarily to interest earned on our cash equivalents and marketable debt securities. 
The primary objective of our investment activities is to preserve our capital to fund operations. A secondary objective is to maximize income from our 
investments without assuming significant risk. Our investment policy provides for investments in low-risk, investment-grade debt instruments. As of 
December 31, 2024, we had cash, cash equivalents, and marketable debt securities totaling $745.0 million, which included bank deposits, money market 
funds, U.S. government treasury and agency securities, and investment-grade corporate bond securities which are subject to default, changes in credit rating, 
and changes in market value. The securities in our investment portfolio are classified as available for sale and are subject to interest rate risk and will 
decrease in value if market interest rates increase. A hypothetical 100 basis point change in interest rates during any of the periods presented would not 
have had a material impact on the fair market value of our cash equivalents and marketable debt securities as of December 31, 2024. To date, we have not 
experienced a loss of principal on any of our investments and as of December 31, 2024, we did not record any allowance for credit loss from our investments.

 
82
Foreign Currency Risk
We face foreign exchange risk as a result of entering into transactions denominated in currencies other than U.S. dollars. Due to the uncertain timing 
of expected payments in foreign currencies, we do not utilize any forward exchange contracts. All foreign transactions settle on the applicable spot exchange 
basis at the time such payments are made. Volatile market conditions arising from the macroeconomic environment (including financial conditions affecting 
the banking system and financial institutions), inflation, or global political instability may result in significant changes in exchange rates, and in particular a 
weakening of foreign currencies relative to the U.S. dollar may negatively affect our revenue and operating income as expressed in U.S. dollars. An adverse 
movement in foreign exchange rates could have a material effect on payments made to foreign suppliers and payments related to license agreements. For 
the year ended December 31, 2024, a majority of our revenue, expenses, and capital expenditures were denominated in U.S. dollars. A hypothetical 10% 
change in foreign exchange rates during any of the periods presented would not have had a material impact on our Consolidated Financial Statements.
Item 8. Financial Statements and Supplementary Data 
Our financial statements are annexed to this Annual Report beginning on page F-1 and are incorporated by reference into this Item 8. 
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 
None. 
 
Item 9A. Controls and Procedures 
Evaluation of Disclosure Controls and Procedures 
Management carried out an evaluation, under the supervision and with the participation of our Principal Executive Officer and our Principal Financial 
Officer, of the effectiveness of our “disclosure controls and procedures” as of the end of the period covered by this Annual Report, pursuant to Rules 13a-
15(e) and 15d-15(e) under the Securities Exchange Act of 1934, or the Exchange Act. In connection with that evaluation, our Principal Executive Officer and 
our Principal Financial Officer concluded that our disclosure controls and procedures were effective and designed to provide reasonable assurance that the 
information required to be disclosed is recorded, processed, summarized, and reported within the time periods specified in the SEC rules and forms as of 
December 31, 2024. For the purpose of this review, disclosure controls and procedures means controls and procedures designed to ensure that information 
required to be disclosed by us in the reports that we file or submit is recorded, processed, summarized and reported within the time periods specified in the 
SEC’s rules and forms. These disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information 
required to be disclosed by us in the reports that we file or submit is accumulated and communicated to management, including our Principal Executive 
Officer and our Principal Financial Officer, as appropriate to allow timely decisions regarding required disclosure. In designing and evaluating the disclosure 
controls and procedures, our management recognizes that any controls and procedures, no matter how well designed and operated, can provide only 
reasonable assurance of achieving the desired control objectives, and our management necessarily applies its judgment in evaluating the cost-benefit 
relationship of possible controls and procedures. 
Management’s Annual Report on Internal Control Over Financial Reporting
Management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-
15(f) of the Exchange Act. Our management used the Committee of Sponsoring Organizations of the Treadway Commission Internal Control - Integrated 
Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), or the COSO framework, to evaluate the 
effectiveness of internal control over financial reporting. Management believes that the COSO framework is a suitable framework for its evaluation of 
financial reporting because it is free from bias, permits reasonably consistent qualitative and quantitative measurements of our internal control over financial 
reporting, is sufficiently complete so that those relevant factors that would alter a conclusion about the effectiveness of our internal control over financial 
reporting are not omitted and is relevant to an evaluation of internal control over financial reporting.
Management has assessed the effectiveness of our internal control over financial reporting as of December 31, 2024, and has concluded that as of 
such date, our internal control over financial reporting was effective. 
Our independent registered public accounting firm, Ernst & Young LLP, has audited the financial statements included in this Annual Report and has 
issued a report on the effectiveness of our internal control over financial reporting. The report of Ernst & Young LLP is included below.

 
83
Changes in Internal Control over Financial Reporting 
There have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) 
during our fourth quarter ended December 31, 2024, that have materially affected, or are reasonably likely to materially affect, our internal control over 
financial reporting.
 

 
84
Report of Independent Registered Public Accounting Firm
To the Stockholders and the Board of Directors of Ultragenyx Pharmaceutical Inc.
 
Opinion on Internal Control Over Financial Reporting 
We have audited Ultragenyx Pharmaceutical Inc.’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal 
Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In 
our opinion, Ultragenyx Pharmaceutical Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of 
December 31, 2024, based on the COSO criteria.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated 
balance sheets of the Company as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive loss, stockholders’ 
equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and our report dated February 19, 2025 
expressed an unqualified opinion thereon.
 
Basis for Opinion 
The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of 
internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our 
responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm 
registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the 
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether effective internal control over financial reporting was maintained in all material respects. 
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and 
evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered 
necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
 
Definition and Limitations of Internal Control Over Financial Reporting 
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and 
the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over 
financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly 
reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to 
permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company 
are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding 
prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial 
statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of 
effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of 
compliance with the policies or procedures may deteriorate.
 
/s/ Ernst & Young LLP
 
San Mateo, California
February 19, 2025
 
Item 9B. Other Information 
During the three months ended December 31, 2024, the following directors and officers adopted a Rule 10b5-1 trading arrangement intended to 
satisfy the affirmative defense conditions of Rule 10b5-1(c).

 
85
Name and Title
Date Adopted
Aggregate Number of Shares 
of Common Stock to be Sold 
(Subject to Certain 
Conditions)
Plan End Date 
Shehnaaz Suliman, M.D., Ph.D.
Board Member
November 8, 2024
Up to 27,110 shares, all of 
which are shares to be 
acquired upon the exercise of 
stock options
November 7, 2025
Corsee Sanders, Ph.D.,
Board Member
 
November 15, 2024
Up to 2,405 shares 
June 26, 2025
Matthew Fust, 
Board Member
November 22, 2024
Up to 15,000 shares, all of 
which are shares to be 
acquired upon the exercise of 
stock options
 November 21, 2025
Eric Crombez, M.D.
EVP, Chief Medical Officer
December 3, 2024 
Up to 64,235 shares, 28,500 of 
which are shares to be 
acquired upon the exercise of 
stock options
December 3, 2025
Howard Horn,
EVP, Chief Financial Officer
December 9, 2024
Up to 17,477 shares
December 9, 2025
 
Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections
Not applicable.

 
86
PART III
 
Item 10. Directors, Executive Officers and Corporate Governance 
Except as set forth below, the information required by this Item is incorporated herein by reference to information in the proxy statement for our 
2025 Annual Meeting of Stockholders, which we will file with the SEC within 120 days of the end of the fiscal year to which this Annual Report relates, or the 
“2025 Proxy Statement”, including under the headings “Nominees and Incumbent Directors,” “Executive Officers,” ““Board of Directors and Committees,” 
“Corporate Governance” and, as applicable, “Delinquent Section 16(a) Beneficial Ownership Reports.” We have adopted a Global Code of Conduct that 
applies to all of our directors, officers and employees, including our principal executive, principal financial and principal accounting officers, or persons 
performing similar functions. Our Global Code of Conduct is posted on our website located at https://ir.ultragenyx.com/ under “Corporate Governance”. We 
intend to disclose future amendments to certain provisions of the Global Code of Conduct, and waivers of the Global Code of Conduct granted to executive 
officers and directors, on the website within four business days following the date of the amendment or waiver.
Item 11. Executive Compensation 
The information required by this Item is incorporated herein by reference to information in the 2025 Proxy Statement, including under the headings 
“Executive Compensation,” “Director Compensation,” and “Board of Directors and Committees.” 
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 
The information required by this Item is incorporated herein by reference to information in the 2025 Proxy Statement, including under the headings 
“Security Ownership of Certain Beneficial Owners and Management” and “Equity Compensation Plan Information.”
Item 13. Certain Relationships and Related Transactions, and Director Independence 
The information required by this Item is incorporated herein by reference to information in the 2025 Proxy Statement, including under the headings 
“Certain Relationships and Related-Person Transactions,” “Corporate Governance,” and “Board of Directors and Committees.” 
Item 14. Principal Accountant Fees and Services 
The information required by this Item is incorporated herein by reference to information in the 2025 Proxy Statement, including under the heading 
“Proposal No. 3—Ratification of the Selection of Independent Registered Public Accounting Firm.” 

 
87
PART IV 
 
Item 15. Exhibits and Financial Statement Schedules
(a)	 The following documents are filed as part of this Annual Report. 
(1)	 Consolidated Financial Statements 
   	
Consolidated Financial Statements—See Index to Consolidated Financial Statements at page F-1 of this Annual Report. 
(2)	 Consolidated Financial Statement Schedules
   	
Consolidated Financial Statement schedules have been omitted in this Annual Report because they are not applicable, not required under 
the instructions, or the information requested is set forth in the Consolidated Financial Statements or related notes thereto.
(b)	 Exhibits 
 
Exhibit
 
 
 
Incorporated by Reference
 
Filed
Number
 
Exhibit Description
 
Form
 
Date
 
Number
 
Herewith
3.1
  Amended and Restated Certificate of Incorporation
 
8-K
 
2/5/2014
 
3.1
 
 
3.2
  Second Amended and Restated Bylaws
 
8-K
 
12/21/2023
 
3.1
 
 
4.1
  Form of Common Stock Certificate
 
S-1
 
11/8/2013
 
4.2
 
 
4.2
  Form of Indenture
 
S-3 ASR  
2/21/2024
 
4.2
 
 
4.3
  Form of Pre-Funded Warrant
 
8-K
 
10/23/2023
 
4.1
 
 
4.4
  Form of Pre-Funded Warrant
 
8-K
 
6/17/2024
 
4.1
 
 
4.5
  Description of Common Stock
 
10-K
 
2/14/2020
 
4.3
 
 
10.1*
  Collaboration and License Agreement, effective as of August 29, 
2013, between Ultragenyx Pharmaceutical Inc. and Kyowa Hakko 
Kirin Co., Ltd.
 
S-1/A
 
12/23/2013
 
10.1
 
 
10.2
  Amendment No. 1 to Collaboration and License Agreement, effective 
as of August 24, 2015, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Hakko Kirin Co., Ltd.
 
10-Q
 
11/10/2015
 
10.2
 
 
10.3
  Amendment No. 2 to Collaboration and License Agreement, effective 
as of November 28, 2016, between Ultragenyx Pharmaceutical Inc. 
and Kyowa Hakko Kirin Co., Ltd.
 
10-K
 
2/21/2018
 
10.3
 
 
10.4*
  Amendment No. 3 to Collaboration and License Agreement, effective 
September 29, 2017, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Hakko Kirin Co., Ltd.
 
10-K
 
2/21/2018
 
10.4
 
 
10.5*
  Amendment No. 4 to Collaboration and License Agreement, effective 
as of January 29, 2018, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Hakko Kirin Co., Ltd.
 
10-K
 
2/21/2018
 
10.5
 
 
10.6*
  Amendment No. 5 to Collaboration and License Agreement, effective 
as of April 30, 2018, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Hakko Kirin Co., Ltd.
 
10-Q
 
8/3/2018
 
10.1
 
 
10.7*
  Amendment No. 6 to Collaboration and License Agreement, effective 
as of February 1, 2019, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Hakko Kirin Co., Ltd.
 
10-Q
 
5/7/2019
 
10.2
 
 

 
88
10.8*
  Amendment No. 7 to Collaboration and License Agreement, effective 
as of December 5, 2018, between Ultragenyx Pharmaceutical Inc. 
and Kyowa Hakko Kirin Co., Ltd.
 
10-Q
 
5/7/2019
 
10.3
 
 
10.9*
  Amendment No. 8 to Collaboration and License Agreement, effective 
as of July 4, 2019, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Kirin Co., Ltd. (formerly, Kyowa Hakko Kirin Co., Ltd.)
 
10-Q
 
8/2/2019
 
10.1
 
 
10.10*
  Amendment No. 9 to Collaboration and License Agreement, effective 
December 23, 2019, between Ultragenyx Pharmaceutical Inc. and 
Kyowa Kirin Co., Ltd.
 
10-K
 
2/14/2020
 
10.10
 
 
10.11*
  Amendment No. 10 to Collaboration and License Agreement, 
effective as of April 1, 2020, between Ultragenyx Pharmaceutical Inc. 
and Kyowa Kirin Co., Ltd.
 
10-Q
 
5/7/2020
 
10.2
 
 
10.12*
  Amendment No. 11 to Collaboration and License Agreement, 
effective as of December 17, 2021 between Ultragenyx 
Pharmaceutical Inc. and Kyowa Kirin Co., Ltd.
 
10-K
 
2/16/2022
 
10.13
 
 
10.13*
  Amendment No. 12 to Collaboration and License Agreement, 
effective as of September 29, 2022, between Ultragenyx 
Pharmaceutical Inc. and Kyowa Kirin Co., Ltd.
 
10-Q
 
11/3/2022
 
10.1
 
 
10.14*
  Amendment No. 13 to Collaboration and License Agreement, 
effective as of May 16, 2023, between Ultragenyx Pharmaceutical 
Inc. and Kyowa Kirin Co., Ltd. 
 
10-Q
 
8/3/2023
 
10.1
 
 
10.15*
  Supply Agreement, effective as of November 18, 2020, between 
Ultragenyx Pharmaceutical Inc. and Kyowa Kirin Inc.
 
 
 
 
 
 
 
X
10.16*
  Amendment No. 1, effective as of September 13, 2024, to the Supply 
Agreement between Ultragenyx Pharmaceutical Inc. and Kyowa 
Kirin, Inc.
 
 
 
 
 
 
 
X
10.17*
  Unit Purchase Agreement, dated as of July 15, 2022, by and among 
Ultragenyx Pharmaceutical Inc., GeneTx Biotherapeutics LLC, the 
Unitholders and Deborah A. Guagliardo
 
10-Q
 
7/29/2022
 
10.2
 
 
10.18*
  Royalty Purchase Agreement, dated as of December 17, 2019, 
between Ultragenyx Pharmaceutical Inc. and RPI Finance Trust
 
10-K
 
2/14/2020
 
10.25
 
 
10.19*
  Royalty Purchase Agreement, dated as of July 14, 2022, by and 
among Rare Delaware Inc., Ultragenyx Pharmaceutical Inc. and OCM 
LS23 Holdings LP
 
10-Q
 
7/29/2022
 
10.1
 
 
10.20#
  2014 Incentive Plan (as amended)
 
10-K
 
2/17/2017
 
10.20
 
 
10.21#
  Form of Incentive Stock Option Agreement (2014 Plan)
 
S-1/A
 
1/17/2014
 
10.14
 
 
10.22#
  Form of Non Statutory Stock Option Agreement (Employees) (2014 
Plan)
 
S-1/A
 
1/17/2014
 
10.15
 
 
10.23#
  Form of Restricted Stock Unit Agreement (Employees) (2014 Plan)
 
10-Q
 
5/10/2016
 
10.1
 
 
10.24#
  Form of Non-Statutory Stock Option Agreement (Annual Grant for 
Directors) (2014 Plan)
 
10-Q
 
8/3/2021
 
10.2
 
 
10.25#
  Form of Restricted Stock Unit Agreement (Annual Grant for 
Directors) (2014 Plan)
 
10-Q
 
8/3/2021
 
10.3
 
 

 
89
10.26#
  Form of Non-Statutory Stock Option Agreement (Grant for New 
Directors) (2014 Plan)
 
10-Q
 
8/3/2021
 
10.4
 
 
10.27#
  Form of Restricted Stock Unit Agreement (Grant for New 
Directors) (2014 Plan)
 
10-Q
 
8/3/2021
 
10.5
 
 
10.28#
  Amended and Restated 2023 Incentive Plan
 
S-8
 
7/12/2024
 
4.4
 
 
10.29#
  Form of Incentive Stock Option Agreement (2023 Plan)
 
10-K
 
2/21/2024
 
10.30
 
 
10.30#
  Form of Non Statutory Stock Option Agreement (Employees)(2023 
Plan)
 
10-K
 
2/21/2024
 
10.31
 
 
10.31#
  Form of Restricted Stock Unit Agreement (Employees) (2023 Plan)
 
10-K
 
2/21/2024
 
10.32
 
 
10.32#
  Form of Non-Statutory Stock Option Agreement (Annual Grant for 
Directors) (2023 Plan)
 
10-K
 
2/21/2024
 
10.33
 
 
10.33#
  Form of Restricted Stock Unit Agreement (Annual Grant for 
Directors) (2023 Plan)
 
10-K
 
2/21/2024
 
10.34
 
 
10.34#
  Form of Non-Statutory Stock Option Agreement (Grant for New 
Directors) (2023 Plan)
 
10-K
 
2/21/2024
 
10.35
 
 
10.35#
  Form of Restricted Stock Unit Agreement (Grant for New Directors) 
(2023 Plan)
 
10-K
 
2/21/2024
 
10.36
 
 
10.36#
  Form of Performance Stock Unit Agreement (2022)
 
10-Q
 
5/6/2022
 
10.1
 
 
10.37#
  Form of Performance Stock Unit Agreement (2023)
 
10-Q
 
5/4/2023
 
10.1
 
 
10.38#
  Form of Performance Stock Unit Agreement (2024)
 
 
 
 
 
 
 
X
10.39#
  Amended and Restated 2014 Employee Stock Purchase Plan
 
S-8
 
6/8/2023
 
4.5
 
 
10.40#
  Corporate Bonus Plan
 
S-1/A
 
1/17/2014
 
10.27
 
 
10.41#
  Employment Inducement Plan
 
10-K
 
2/12/2021
 
10.43
 
 
10.42#
  First Amendment to Employment Inducement Plan 
 
S-8
 
6/8/2023
 
4.7
 
 
10.43#
  Second Amendment to Employment Inducement Plan
 
S-8
 
7/12/2024
 
4.7
 
 
10.44#
  Form of Non Statutory Stock Option Agreement (Inducement Plan)
 
10-K
 
2/12/2021
 
10.44
 
 
10.45#
  Form of Non Statutory Stock Option Agreement (Inducement Plan) 
(ex-US)
 
10-K
 
2/12/2021
 
10.45
 
 
10.46#
  Form of Restricted Stock Unit Agreement (Inducement Plan)
 
10-K
 
2/12/2021
 
10.46
 
 
10.47#
  Form of Restricted Stock Unit Agreement (Inducement Plan)(ex-US)
 
10-K
 
2/12/2021
 
10.47
 
 
10.48#
  Ultragenyx Pharmaceutical Inc. Deferred Compensation Plan
 
10-Q
 
8/3/2021
 
10.1
 
 
10.49#
  Amendment No. 1 to the Ultragenyx Pharmaceutical Inc. Deferred 
Compensation Plan
 
10-Q
 
11/3/2021
 
10.1
 
 
10.50#
  Executive Employment Agreement, dated as of June 15, 2011, 
between Ultragenyx Pharmaceutical Inc. and Emil D. Kakkis, M.D., 
Ph.D.
 
S-1
 
11/8/2013
 
10.18
 
 
10.51#
  Amendment No. 1 to Executive Employment Agreement, dated 
August 8, 2014, between Ultragenyx Pharmaceutical Inc. and Emil D. 
Kakkis, M.D., Ph.D.
 
10-Q
 
8/11/2014
 
10.2
 
 

 
90
10.52#
  Amendment No. 2, dated September 13, 2022, to Executive 
Employment Agreement between Ultragenyx Pharmaceutical Inc. 
and Emil D. Kakkis, M.D., Ph.D.
 
10-Q
 
11/3/2022
 
10.2
 
 
10.53#
  Offer Letter, dated as of October 31, 2011, between Ultragenyx 
Pharmaceutical Inc. and Thomas Kassberg
 
S-1
 
11/8/2013
 
10.19
 
 
10.54#
  Amendment No. 1 to Offer Letter, dated as of August 8, 2014, 
between Ultragenyx Pharmaceutical Inc. and Thomas Kassberg
 
10-Q
 
8/11/2014
 
10.3
 
 
10.55#
  Amendment No. 2, dated September 13, 2022, to Offer Letter 
between Ultragenyx Pharmaceutical Inc. and Thomas Kassberg
 
10-Q
 
11/3/2022
 
10.5
 
 
10.56#
  Offer Letter, dated as of April 26, 2016, between Ultragenyx 
Pharmaceutical Inc. and Karah Parschauer
 
10-Q
 
8/9/2016
 
10.3
 
 
10.57#
  Amendment, dated September 13, 2022, to Offer Letter between 
Ultragenyx Pharmaceutical Inc. and Karah Parschauer
 
10-Q
 
11/3/2022
 
10.6
 
 
10.58#
  Offer Letter, dated as of February 20, 2015, between Ultragenyx 
Pharmaceutical Inc. and Dennis Huang
 
10-K
 
2/17/2017
 
10.36
 
 
10.59#
  Amendment, dated September 13, 2022, to Offer Letter between 
Ultragenyx Pharmaceutical Inc. and Dennis Huang
 
10-Q
 
11/3/2022
 
10.7
 
 
10.60#
  Offer Letter, dated as of June 11, 2015, between Ultragenyx 
Pharmaceutical Inc. and John R. Pinion II
 
10-K
 
2/17/2017
 
10.37
 
 
10.61#
  Amendment, dated September 13, 2022, to Offer Letter between 
Ultragenyx Pharmaceutical Inc. and John R. Pinion II
 
10-Q
 
11/3/2022
 
10.9
 
 
10.62#
  Amended and Restated Offer Letter, dated March 31, 2023, between 
Ultragenyx Pharmaceutical Inc. and Eric Crombez, M.D.
 
10-Q
 
5/4/2023
 
10.2
 
 
10.63#
  Offer Letter, dated June 2, 2023, between Ultragenyx 
Pharmaceutical Inc. and Howard Horn
 
8-K
 
7/12/2023
 
10.1
 
 
10.64#
  Amendment, dated September 6, 2023, to the Offer Letter between 
Ultragenyx Pharmaceutical Inc. and Howard Horn
 
8-K
 
9/8/2023
 
10.1
 
 
10.65#
  Offer Letter, dated May 16, 2017, between Ultragenyx 
Pharmaceutical Inc. and Erik Harris
 
10-Q
 
8/2/2019
 
10.4
 
 
10.66#
  Addendum #1, dated August 8, 2017, to Offer Letter dated May 16, 
2017 between Ultragenyx Pharmaceutical Inc. and Erik Harris
 
10-Q
 
8/2/2019
 
10.5
 
 
10.67#
  Addendum #2, dated June 19, 2019, to Offer Letter dated May 16, 
2017 between Ultragenyx Pharmaceutical Inc. and Erik Harris
 
10-Q
 
8/2/2019
 
10.6
 
 
10.68#
  Amendment No. 3, dated September 13, 2022, to Offer Letter 
between Ultragenyx Pharmaceutical Inc. and Erik Harris
 
10-Q
 
11/3/2022
 
10.8
 
 
10.69#
  Form of Indemnification Agreement
 
10-K
 
3/24/2014
 
10.23
 
 
10.70
  Standard Lease, dated as of July 5, 2011, between Ultragenyx 
Pharmaceutical Inc. and Condiotti Enterprises, Inc.
 
S-1
 
11/8/2013
 
10.22
 
 

 
91
10.71
  Addendum One to Standard Lease, dated as of July 5, 2011, between 
Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, Inc.
 
10-K
 
2/26/2016
 
10.34
 
 
10.72
  Addendum Two to Standard Lease, dated as of March 7, 2012, 
between Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, 
Inc.
 
10-K
 
2/26/2016
 
10.35
 
 
10.73
  Addendum #3 to Standard Lease, effective as of February 12, 2014, 
between Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, 
Inc.
 
8-K
 
2/25/2014
 
10.1
 
 
10.74
  Addendum #4 to Standard Lease, effective as of March 9, 2015, 
between Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, 
Inc.
 
8-K
 
3/13/2015
 
10.1
 
 
10.75
  Addendum #5 to Standard Lease, effective as of April 7, 2015, 
between Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, 
Inc.
 
10-K
 
2/26/2016
 
10.38
 
 
10.76
  Addendum #6 to Standard Lease, effective as of April 29, 2019, 
between Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, 
Inc.
 
10-Q
 
8/2/2019
 
10.3
 
 
10.77
  Addendum #7 to Standard Lease, effective as of November 22, 2024, 
between Ultragenyx Pharmaceutical Inc. and Condiotti Enterprises, 
Inc.
 
 
 
 
 
 
 
X
10.78
  Lease Agreement, dated as of December 8, 2015, between Marina 
Boulevard Property, LLC and Ultragenyx Pharmaceutical Inc.
 
10-K
 
2/26/2016
 
10.43
 
 
10.79
  Lease Agreement, dated November 2, 2015, between Dimension 
Therapeutics, Inc. and ARE-MA Region No. 20, LLC, and Consent to 
Assignment to Ultragenyx Pharmaceutical Inc.
 
10-K
 
2/21/2018
 
10.66
 
 
10.80
  First Amendment to Lease Agreement, dated March 20, 2018, 
between Ultragenyx Pharmaceutical Inc. and ARE-MA Region No. 20, 
LLC
 
10-Q
 
5/8/2018
 
10.6
 
 
10.81
  Second Amendment to Lease Agreement, dated July 1, 2018, 
between Ultragenyx Pharmaceutical Inc. and ARE-MA Region No. 20, 
LLC
 
10-Q
 
8/3/2018
 
10.3
 
 
10.82
  Third Amendment to the Lease Agreement, dated July 29, 2019, 
between Ultragenyx Pharmaceutical Inc. and ARE-MA Region No., 
LLC.
 
10-Q
 
7/30/2020
 
10.2
 
 
10.83
  Amended and Restated Fourth Amendment, dated August 4, 2020, 
to the Lease Agreement between Ultragenyx Pharmaceutical Inc. 
and ARE-MA Region No., LLC.
 
10-Q
 
10/27/2020
 
10.5
 
 
10.84
  Fifth Amendment, dated November 25, 2024, to the Lease 
Agreement between Ultragenyx Pharmaceutical Inc. and ARE-MA 
Region No. 20, LLC
 
 
 
 
 
 
 
X
10.85
  Lease Agreement, dated December 15, 2019, between Ultragenyx 
Pharmaceutical Inc. and ARE-San Francisco No. 17, LLC.
 
10-K
 
2/12/2021
 
10.81
 
 
10.86
  First Amendment, dated September 20, 2020, to the Lease 
Agreement between Ultragenyx Pharmaceutical Inc. and ARE-San 
Francisco No. 17, LLC.
 
10-K
 
2/12/2021
 
10.82
 
 

 
92
10.87
  Second Amendment, dated October 21, 2020, to the Lease 
Agreement between Ultragenyx Pharmaceutical Inc. and ARE-San 
Francisco No. 17, LLC.
 
10-K
 
2/12/2021
 
10.83
 
 
10.88
  Third Amendment, dated July 27, 2022, to the Lease Agreement 
between Ultragenyx Pharmaceutical Inc. and ARE-San Francisco No. 
17, LLC
 
10-K
 
2/16/2023
 
10.92
 
 
10.89
  Fourth Amendment, dated December 13, 2024, to the Lease 
Agreement between Ultragenyx Pharmaceutical Inc. and GI ETS 
Shoreline LLC (as successor-in-interest to ARE-San Francisco No. 17, 
LLC)
 
 
 
 
 
 
 
X
10.90
  Office Lease, dated April 19, 2019, between Ultragenyx 
Pharmaceutical Inc. and Woburn MCB II, LLC
 
10-K
 
2/14/2020
 
10.70
 
 
10.91
  Commercial Lease, dated July 2, 2018, between Ultragenyx 
Pharmaceutical Inc. and 32 Leveroni LLC
 
10-K
 
2/14/2020
 
10.71
 
 
10.92
  Lease, dated August 18, 2022, between Ultragenyx Pharmaceutical 
Inc. and Brickbottom I QOZB L.P.
 
10-K
 
2/17/2023
 
10.95
 
 
10.93
  First Amendment, dated March 12, 2024, between Ultragenyx 
Pharmaceutical Inc. and Brickbottom I QOZB L.P.
 
 
 
 
 
 
 
X
19.1
  Ultragenyx Insider Trading Policy
 
 
 
 
 
 
 
X
21.1
  Subsidiaries of Ultragenyx Pharmaceutical Inc.
 
 
 
 
 
 
 
X
23.1
  Consent of Independent Registered Public Accounting Firm
 
 
 
 
 
 
 
X
24.1
  Power of Attorney (included on the signature page of this report)
 
 
 
 
 
 
 
 
31.1
  Certification of Principal Executive Officer of Ultragenyx 
Pharmaceutical Inc., as required by Rule 13a-14(a) or Rule 15d-14(a) 
of the Exchange Act as adopted pursuant to Section 302 of the 
Sarbanes-Oxley Act of 2002
 
 
 
 
 
 
 
X
31.2
  Certification of Principal Financial Officer of Ultragenyx 
Pharmaceutical Inc., as required by Rule 13a-14(a) or Rule 15d-14(a) 
of the Exchange Act as adopted pursuant to Section 302 of the 
Sarbanes-Oxley Act of 2002
 
 
 
 
 
 
 
X
32.1§
  Certification by the Principal Executive Officer and Principal Financial 
Officer, as required by Rule 13a-14(b) or Rule 15d-14(b) and Section 
1350 of Chapter 36 of Title 18 of the United States Code (18 U.S.C. 
§1350)
 
 
 
 
 
 
 
X
97.1
  Ultragenyx Pharmaceutical Inc. Clawback Policy 
 
 
 
2/21/2024
 
97.1
 
 
101.INS
  XBRL Instance Document, formatted in Inline XBRL
 
 
 
 
 
 
 
X
101.SCH
  Inline XBRL Taxonomy Extension Schema Document
 
 
 
 
 
 
 
X
104
  The cover page from this Annual Report on Form 10-K, formatted in 
Inline XBRL and contained in Exhibit 101
 
 
 
 
 
 
 
X
 
 
* Certain identified information has been omitted by means of marking such information with asterisks in reliance on Item 601(b)(10)(iv) of Regulation S-K 
because it is both (i) not material and (ii) the type that the registrant treats as private or confidential.
# Indicates management contract or compensatory plan.

 
93
§ The certification attached as Exhibit 32.1 that accompanies this Annual Report is not deemed filed with the SEC and is not to be incorporated by reference 
into any filing of Ultragenyx Pharmaceutical Inc. under the Securities Act or the Exchange Act, whether made before or after the date of this Annual Report, 
irrespective of any general incorporation language contained in such filing. 
Item 16. Form 10-K Summary
None.

 
94
SIGNATURES 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on 
its behalf by the undersigned, thereunto duly authorized. 
ULTRAGENYX PHARMACEUTICAL Inc.
 
By:
 
 
 /s/ Emil D. Kakkis
 
 
Emil D. Kakkis, M.D., Ph.D.
 
 
President and Chief Executive Officer
(Principal Executive Officer)
Date: February 19, 2025
POWER OF ATTORNEY 
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Emil D. Kakkis, M.D., Ph.D. and 
Howard Horn, and each of them, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution for him or her, and in his or her 
name in any and all capacities, to sign any and all amendments to this Annual Report, and to file the same, with exhibits thereto and other documents in 
connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and 
authority to do and perform each and every act and thing requisite and necessary to be done therewith, as fully to all intents and purposes as he or she 
might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, and any of them, his or her substitute or substitutes, 
may lawfully do or cause to be done by virtue hereof. 
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the 
registrant and in the capacities and on the dates indicated. 
 
Signature
 
 
 
Title
 
 
 
Date
 
/s/ Emil D. Kakkis
 Emil D. Kakkis, M.D., Ph.D.
 
President and Chief Executive Officer and Director
(Principal Executive Officer)
 
February 19, 2025
 
/s/ Howard Horn
 Howard Horn
 
Executive Vice President, Chief Financial Officer, Corporate Strategy
(Principal Financial Officer)
 
February 19, 2025
 
/s/ Theodore A. Huizenga
 Theodore A. Huizenga
 
 
Senior Vice President and Chief Accounting Officer
(Principal Accounting Officer)
 
 
February 19, 2025
 
/s/ Daniel G. Welch
 Daniel G. Welch
 
 
Chairman of the Board
 
 
February 19, 2025
 
/s/ Deborah Dunsire
Deborah Dunsire, M.D.
 
 
Director
 
 
February 19, 2025
 
/s/ Matthew K. Fust
 Matthew K. Fust
 
 
Director
 
 
February 19, 2025
 
/s/ Michael Narachi
 Michael Narachi
 
 
Director
 
 
February 19, 2025
 
/s/ Amrit Ray
 
 
Director
 
 
February 19, 2025
Amrit Ray, M.D.
 
 
 
/s/ Corsee D. Sanders
 
 
Director
 
February 19, 2025
 Corsee D. Sanders, Ph.D.
 
 
 
 
/s/ Shehnaaz Suliman
 
  
Director
 
 
February 19, 2025
Shehnaaz Suliman, M.D.
 
 
 

 
F-1
Ultragenyx Pharmaceutical Inc. 
INDEX TO FINANCIAL STATEMENTS 
 
 
Page
Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)
F-2
Consolidated Financial Statements:
 
Consolidated Balance Sheets
F-4
Consolidated Statements of Operations
F-5
Consolidated Statements of Comprehensive Loss
F-5
Consolidated Statements of Stockholders’ Equity 
F-6
Consolidated Statements of Cash Flows
F-7
Notes to Consolidated Financial Statements
F-9
 
 
 

 
F-2
Report of Independent Registered Public Accounting Firm
 
To the Stockholders and the Board of Directors of Ultragenyx Pharmaceutical Inc.
 
Opinion on the Financial Statements 
We have audited the accompanying consolidated balance sheets of Ultragenyx Pharmaceutical Inc. (the Company) as of December 31, 2024 and 2023, the 
related consolidated statements of operations, comprehensive loss, stockholders' equity and cash flows for each of the three years in the period ended 
December 31, 2024, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial 
statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and 
its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal 
control over financial reporting as of December 31, 2024, based on criteria established in Internal Control—Integrated Framework issued by the Committee 
of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 19, 2025 expressed an unqualified opinion 
thereon.
 
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company’s financial 
statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the 
Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the 
PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing 
procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond 
to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits 
also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the 
financial statements. We believe that our audits provide a reasonable basis for our opinion.
 
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or 
required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) 
involved our especially challenging, subjective or complex judgments. The communication of the critical audit matter does not alter in any way our opinion 
on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion 
on the critical audit matter or on the account or disclosure to which it relates.
 
 
Liabilities for sales of future royalties
Description 
of the 
Matter
As discussed in Note 11, the Company has entered into two royalty purchase agreements, under which the Company 
sold its rights to receive royalty payments arising from the net sales of Crysvita in the European and North American 
markets in exchange for $320 million and $500 million, respectively. The proceeds from each transaction were 
recorded as liabilities that are being amortized using the effective interest method over the estimated lives of the 
respective arrangements. In order to determine the amortization of the liabilities, the Company is required to 
estimate the total amount of future royalty payments to be paid to the respective counterparty, subject to the 
capped amount, over the life of the arrangement. The Company estimates an imputed interest on the unamortized 
portion of the liability and records non-cash interest expense relating to the transaction.
Auditing the Company’s liabilities related to the sale of future royalties was complex due to the subjective judgments 
required to forecast the expected royalty payments subject to each agreement. Specifically, the forecasted revenues 
of Crysvita involve significant estimation uncertainty given the limited historical Crysvita sales data.
 
 
How We 
Addressed 
the Matter 
We obtained an understanding, evaluated the design and tested the operating effectiveness of controls over the 
Company’s process of accounting for the liabilities related to the sale of future royalties, including controls over the 
Company’s estimates of projected sales of Crysvita in the European and North American markets. 

 
F-3
in Our Audit  
To test management’s estimates of the future royalties and the amount of imputed effective interest rates, we 
performed audit procedures that included, among others, evaluating the reasonableness of management’s 
assumptions related to the forecasted revenue growth rates, including treatable patient populations, estimated 
pricing and reimbursement, and the rate of adoption. We compared the significant assumptions with historical 
trends of actual sales, analyst expectations and performed sensitivity analyses of estimated future royalties to 
evaluate the changes in the future royalties on the implied effective interest rates. 
 
/s/ Ernst & Young LLP
 
We have served as the Company’s auditor since 2012.
 
San Mateo, California 
February 19, 2025

 
F-4
ULTRAGENYX PHARMACEUTICAL INC. 
CONSOLIDATED BALANCE SHEETS 
(In thousands, except share and per share amounts)
 
 
 
December 31,
 
 
 
2024
   
2023
 
ASSETS
 
Current assets:
 
    
   
Cash and cash equivalents
 
$
173,729    
$
213,584  
Marketable debt securities
 
 
436,296    
 
363,625  
Accounts receivable, net
 
 
121,801    
 
73,390  
Inventory
 
 
45,007    
 
33,969  
Prepaid expenses and other assets
 
 
40,290    
 
47,616  
Total current assets
 
 
817,123    
 
732,184  
Property, plant, and equipment, net
 
 
265,929    
 
290,566  
Marketable debt securities
 
 
135,004    
 
199,901  
Intangible assets, net
 
 
178,314    
 
166,271  
Goodwill
 
 
44,406    
 
44,406  
Other assets
 
 
62,680    
 
57,685  
Total assets
 
$
1,503,456    
$
1,491,013  
LIABILITIES AND STOCKHOLDERS' EQUITY
 
Current liabilities:
 
 
   
 
 
Accounts payable
 
$
38,756    
$
42,114  
Accrued liabilities
 
 
240,973    
 
196,486  
Lease liabilities
 
 
10,297    
 
12,595  
Liabilities for sales of future royalties
 
 
49,847    
 
29,242  
Other liabilities
 
 
4,280    
 
—  
Total current liabilities
 
 
344,153    
 
280,437  
Lease liabilities
 
 
30,042    
 
30,574  
Deferred tax liabilities
 
 
30,058    
 
30,058  
Liabilities for sales of future royalties
 
 
819,824    
 
862,325  
Other liabilities
 
 
17,082    
 
12,205  
Total liabilities
 
 
1,241,159    
 
1,215,599  
Commitments and contingencies (Note 16)
 
 
   
 
 
Noncontrolling interest
 
 
7,000    
 
—  
Stockholders’ equity:
 
 
   
 
 
Preferred stock, par value of $0.001 per share—25,000,000 shares authorized; nil
   outstanding in 2024 and in 2023
 
 
—    
 
—  
Common stock, par value of $0.001 per share—250,000,000 shares authorized;
  outstanding—92,484,330 in 2024 and 82,315,590 in 2023
 
 
92    
 
82  
Treasury stock, at cost, 69,757 in 2024 and 9,559 in 2023
 
 
(3,593 )  
 
(432 )
Deferred compensation obligation
 
 
3,593    
 
432  
Additional paid-in capital
 
 
4,212,692    
 
3,662,346  
Accumulated other comprehensive (loss) income
 
 
(643 )  
 
647  
Accumulated deficit
 
 
(3,956,844 )  
 
(3,387,661 )
Total stockholders’ equity
 
 
255,297    
 
275,414  
Total liabilities, noncontrolling interest and stockholders’ equity
 
$
1,503,456    
$
1,491,013  
See accompanying notes.
(1)
The Company's Consolidated Balance Sheet as of December 31, 2024 includes $13.5 million in cash and cash equivalents that can be used only to settle obligations 
of the consolidated variable interest entity. See "Note 7. Investment in Amlogenyx Inc."
 
(1)

 
F-5
ULTRAGENYX PHARMACEUTICAL INC.
CONSOLIDATED STATEMENTS OF OPERATIONS 
(In thousands, except share and per share amounts)
 
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Revenues:
   
     
     
 
Product sales
  $
285,415     $
180,413     $
118,927  
Royalty revenue
   
274,815      
182,652      
21,692  
Collaboration and license
   
—      
71,184      
222,710  
Total revenues
   
560,230      
434,249      
363,329  
Operating expenses:
   
     
     
 
Cost of sales
   
76,728      
45,209      
28,320  
Research and development
   
697,865      
648,449      
705,789  
Selling, general and administrative
   
321,610      
309,799      
278,139  
Total operating expenses
   
1,096,203      
1,003,457      
1,012,248  
Loss from operations
   
(535,973 )    
(569,208 )    
(648,919 )
Interest income
   
36,506      
26,688      
11,074  
Change in fair value of equity investments
   
(1,115 )    
397      
(19,299 )
Non-cash interest expense on liabilities for sales of future royalties
   
(63,041 )    
(66,004 )    
(43,015 )
Other expense
   
(3,963 )    
(337 )    
(1,566 )
Loss before income taxes
   
(567,586 )    
(608,464 )    
(701,725 )
(Provision for) benefit from income taxes
   
(1,597 )    
1,825      
(5,696 )
Net loss
  $
(569,183 )   $
(606,639 )   $
(707,421 )
Net loss per share, basic and diluted
  $
(6.29 )   $
(8.25 )   $
(10.12 )
Shares used in computing net loss per share, basic and diluted
   
90,538,118      
73,543,862      
69,914,225  
See accompanying notes.
 
 
 
ULTRAGENYX PHARMACEUTICAL INC. 
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS 
(In thousands)
 
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Net loss
  $
(569,183 )   $
(606,639 )   $
(707,421 )
Other comprehensive income (loss):
 
    
    
   
Foreign currency translation adjustments
   
(1,044 )    
239      
(724 )
Changes in unrealized gain (loss) on available-for-sale securities
   
(246 )    
6,981      
(4,445 )
Other comprehensive income (loss):
   
(1,290 )    
7,220      
(5,169 )
Total comprehensive loss
  $
(570,473 )   $
(599,419 )   $
(712,590 )
See accompanying notes. 
 
 
 

 
F-6
ULTRAGENYX PHARMACEUTICAL INC. 
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY 
 
(In thousands, except share amounts)
 
Common Stock
   
Additional
Paid-In
   
Accumulate
d
Other
Comprehens
ive
   
Accumulate
d
   
Treasury
   
Deferred 
Compensati
on
   
Total
Stockholders
'
 
 
 
Shares
   
Amount
   
Capital
   
Income 
(Loss)
   
Deficit
   
Stock
   
Obligation
   
Equity
 
Balance as of December 31, 2021
 
 
69,344,998     $
69     $
2,997,497     $
(1,404 )   $ (2,073,601 )   $
—     $
—     $
922,561  
Stock-based compensation
 
 
—      
—      
131,710      
—      
—      
—      
—      
131,710  
Issuance of common stock under
   equity plan awards, net of tax
 
 
852,299      
1      
10,812      
—      
—      
—      
—      
10,813  
Other comprehensive loss
 
 
—      
—      
—      
(5,169 )    
—      
—      
—      
(5,169 )
Net loss
 
 
—      
—      
—      
—      
(707,421 )    
—      
—      
(707,421 )
Balance as of December 31, 2022
 
 
70,197,297     $
70     $
3,140,019     $
(6,573 )   $ (2,781,022 )   $
—     $
—     $
352,494  
Issuance of common stock and pre-funded 
warrants in connection with underwritten
   public offering, net of issuance costs
 
 
9,833,334      
10      
326,446      
—      
—      
—      
—      
326,456  
Issuance of common stock in connection 
with
  at-the-market offering, net of issuance 
costs
 
 
1,175,584      
1      
53,298      
—      
—      
—      
—      
53,299  
Stock-based compensation
 
 
—      
—      
134,169      
—      
—      
—      
—      
134,169  
Issuance of common stock under
   equity plan awards, net of tax
 
 
1,109,375      
1      
8,414      
—      
—      
—      
—      
8,415  
Deferred compensation
 
 
—      
—      
—      
—      
—      
(432 )    
432      
—  
Other comprehensive income
 
 
—      
—      
—      
7,220      
—      
—      
—      
7,220  
Net loss
 
 
—      
—      
—      
—      
(606,639 )    
—      
—      
(606,639 )
Balance as of December 31, 2023
 
 
82,315,590     $
82     $
3,662,346     $
647     $ (3,387,661 )   $
(432 )   $
432     $
275,414  
Issuance of common stock and pre-funded 
warrants in connection with underwritten
   public offering, net of issuance costs
 
 
8,782,051      
9      
380,974      
—      
—      
—      
—      
380,983  
Stock-based compensation
 
 
—      
—      
158,115      
—      
—      
—      
—      
158,115  
Issuance of common stock under
   equity plan awards, net of tax
 
 
1,386,689      
1      
11,257      
—      
—      
—      
—      
11,258  
Deferred compensation
 
 
—      
—      
—      
—      
—      
(3,161 )    
3,161      
—  
Other comprehensive loss
 
 
—      
—      
—      
(1,290 )    
—      
—      
—      
(1,290 )
Net loss
 
 
—      
—      
—      
—      
(569,183 )    
—      
—      
(569,183 )
Balance as of December 31, 2024
 
 
92,484,330     $
92     $
4,212,692     $
(643 )   $ (3,956,844 )   $
(3,593 )   $
3,593     $
255,297  
See accompanying notes.
 
 
 

 
F-7
ULTRAGENYX PHARMACEUTICAL INC. 
CONSOLIDATED STATEMENTS OF CASH FLOWS 
(In thousands)
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Operating activities:
    
    
   
Net loss
$
(569,183 )   $
(606,639 )   $
(707,421 )
Adjustments to reconcile net loss to net cash used in operating activities:
 
     
     
 
Stock-based compensation
 
158,030      
135,227      
130,377  
Acquired in-process research and development
 
—      
—      
75,033  
Amortization of premium (discount) on marketable debt securities, net
 
(12,624 )    
(12,842 )    
2,699  
Depreciation and amortization
 
35,543      
26,006      
18,220  
Change in fair value of equity investments
 
1,115      
(397 )    
19,299  
Non-cash collaboration royalty revenue
 
(100,539 )    
(69,364 )    
(21,692 )
Non-cash interest expense on liabilities for sales of future royalties
 
63,041      
66,004      
43,015  
Other
 
(3,489 )    
2,300      
(230 )
Changes in operating assets and liabilities:
 
     
     
 
Accounts receivable
 
(33,598 )    
(22,778 )    
(12,068 )
Inventory
 
(11,207 )    
(6,930 )    
(9,701 )
Prepaid expenses and other assets
 
11,731      
15,325      
3,798  
Accounts payable, accrued, and other liabilities
 
46,992      
901      
79,845  
Deferred tax liabilities
 
—      
(1,619 )    
(1,639 )
Net cash used in operating activities
 
(414,188 )    
(474,806 )    
(380,465 )
Investing activities:
 
     
     
 
Purchase of property, plant, and equipment
 
(7,491 )    
(44,267 )    
(116,123 )
Acquisition, net of cash acquired
 
—      
—      
(75,025 )
Purchase of marketable debt securities
 
(408,613 )    
(526,382 )    
(614,735 )
Proceeds from sale of marketable debt securities
 
3,247      
50,672      
84,275  
Proceeds from sale of equity investments
 
—      
—      
10,094  
Proceeds from maturities of marketable debt securities
 
410,025      
695,525      
450,706  
Payment for intangible asset
 
(12,500 )    
(2,500 )    
(30,000 )
Other
 
(2,436 )    
(5,048 )    
(844 )
Net cash (used in) provided by investing activities
 
(17,768 )    
168,000      
(291,652 )
Financing activities:
 
     
     
 
Proceeds from the sale of future royalties, net
 
—      
—      
490,950  
Proceeds from the issuance of common stock and pre-funded warrants in connection with 
underwritten 
    public offerings, net of issuance costs
 
380,983      
326,456      
—  
Proceeds from the issuance of common stock in connection with at-the-market
   offering, net of issuances costs
 
—      
53,299      
—  
Proceeds from the issuance of common stock from exercise of equity
    plan awards, net
 
11,258      
8,415      
10,813  
Proceeds from issuance of equity interest in noncontrolling interest
 
7,000      
—      
—  
Other
 
—      
(28 )    
(555 )
Net cash provided by financing activities
 
399,241      
388,142      
501,208  
Effect of exchange rate changes on cash
 
(2,525 )    
462      
(1,075 )
Net (decrease) increase in cash, cash equivalents, and restricted cash
 
(35,240 )    
81,798      
(171,984 )
Cash, cash equivalents, and restricted cash at beginning of year
 
219,399      
137,601      
309,585  
Cash, cash equivalents, and restricted cash at end of year
$
184,159     $
219,399     $
137,601  
See accompanying notes. 

 
F-8
ULTRAGENYX PHARMACEUTICAL INC. 
CONSOLIDATED STATEMENTS OF CASH FLOWS 
(In thousands)
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Supplemental disclosures of non-cash investing and financing information:
 
     
     
 
Acquired lease liabilities arising from obtaining right-of-use assets and property, plant, and 
equipment
$
9,609     $
22,162     $
1,168  
Costs of property, plant and equipment included in accounts payable, accrued, and other liabilities $
693     $
1,577     $
17,963  
Non-cash interest expense on liabilities for sales of future royalties capitalized during the year into 
ending property, plant and equipment
$
—     $
9,431     $
11,380  
See accompanying notes.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements
 
1.
Organization and Basis of Presentation 
Ultragenyx Pharmaceutical Inc., or the Company, is a biopharmaceutical company incorporated in Delaware.
The Company is focused on the identification, acquisition, development, and commercialization of novel products for the treatment of serious rare 
and ultrarare genetic diseases. The Company operates as one reportable segment and has four commercially approved products. 
Crysvita® (burosumab) is approved in the United States, or U.S., the European Union, or EU, and certain other regions for the treatment of X-linked 
hypophosphatemia, or XLH, in adult and pediatric patients one year of age and older. Crysvita is also approved in the U.S. and certain other regions for the 
treatment of fibroblast growth factor 23, or FGF23-related hypophosphatemia in tumor-induced osteomalacia, or TIO, associated with phosphaturic 
mesenchymal tumors that cannot be curatively resected or localized in adults and pediatric patients 2 years of age and older.
Mepsevii® (vestronidase alfa) is approved in the U.S., the EU and certain other regions, as the first medicine for the treatment of children and adults 
with mucopolysaccharidosis VII, or MPS VII, also known as Sly syndrome.
Dojolvi® (triheptanoin) is approved in the U.S. and certain other regions for the treatment of pediatric and adult patients severely affected by long-
chain fatty acid oxidation disorders, or LC-FAOD.
Evkeeza® (evinacumab) is approved in the U.S. and the European Economic Area, or EEA, and Japan for the treatment of homozygous familial 
hypercholesterolemia, or HoFH. The Company has exclusive rights to commercialize Evkeeza® (evinacumab) outside of the U.S.
In addition to the approved products, the Company has the following ongoing clinical development programs: 
•
UX111 (formerly ABO-102) is an AAV9 gene therapy product candidate for the treatment of patients with Sanfilippo syndrome type A, or MPS 
IIIA, a rare lysosomal storage disease;
•
DTX401 is an adeno-associated virus 8, or AAV8, gene therapy product candidate for the treatment of patients with glycogen storage disease 
type Ia, or GSDIa;
•
DTX301 is an AAV8 gene therapy product candidate in development for the treatment of patients with ornithine transcarbamylase, or OTC 
deficiency, the most common urea cycle disorder;
•
UX143 (setrusumab), which is subject to the Company’s collaboration agreement with Mereo BioPharma 3, or Mereo, is a fully human 
monoclonal antibody that inhibits sclerostin, a protein that acts on a key bone-signaling pathway and inhibits the activity of bone-forming cells 
for the treatment of patients with Osteogenesis Imperfecta, or OI;
•
GTX-102 is an antisense oligonucleotide, or ASO for the treatment of Angelman syndrome, a debilitating and rare neurogenetic disorder 
caused by loss-of-function of the maternally inherited allele of the UBE3A gene; and
•
UX701 is an adeno-associated virus 9, or AAV9, gene therapy designed to deliver stable expression of a truncated version of the ATP7B copper 
transporter following a single intravenous infusion to improve copper distribution and excretion from the body and reverse pathological 
findings of Wilson liver disease.
 
The Company has sustained operating losses and expects such annual losses to continue in the near term. The Company’s ultimate success depends 
on the outcome of its research and development and commercialization activities. Through December 31, 2024, the Company has relied primarily on its sale 
of equity securities, its revenues from commercial products, its sale of future royalties, and strategic collaboration arrangements to finance its operations. 
The Company may need to raise additional capital to fully implement its business plans through the issuance of equity, borrowings, or strategic alliances with 
partner companies. However, if such financing is not available at adequate levels, the Company would need to reevaluate its operating plans.
2.
Summary of Significant Accounting Policies 
Basis of Consolidation 
The Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. The Company consolidates any 
variable interest entity, or VIE, for which it is the primary beneficiary.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-10
Segment Reporting 
The Company operates as one reportable segment relating to the research, development and commercialization of its products. The segment derives 
its current revenues from its four commercially approved products.
The Company’s Chief Operating Decision Maker, or CODM, its Chief Executive Officer and the executive leadership team, manage the Company’s 
operations on an integrated basis for the purposes of allocating resources. When evaluating the Company’s financial performance, the CODM regularly 
reviews total revenues and total expenses and makes decisions using this information on a global basis.
Use of Estimates 
The accompanying Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP. 
The preparation of the Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the 
reported amounts of assets and liabilities, disclosure of contingent liabilities and the reported amounts of expenses in the Consolidated Financial Statements 
and the accompanying notes. On an ongoing basis, management evaluates its estimates, including those related to clinical trial accruals, fair value of assets 
and liabilities, income taxes, stock-based compensation, revenue recognition, and the liabilities for sales of future royalties. Management bases its estimates 
on historical experience and on various other market-specific and relevant assumptions that management believes to be reasonable under the 
circumstances. Actual results could differ from those estimates.
Cash, Cash Equivalents, and Restricted Cash 
The Company considers all highly liquid investments with original maturities of three months or less from the date of purchase to be cash equivalents. 
Cash equivalents consist primarily of amounts invested in money market accounts.
Restricted cash primarily consists of money market accounts used as collateral for the Company’s obligations under its facility leases and to guarantee 
the fulfillment of certain sales orders to certain government-sponsored customers.
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum 
to the total of the same such amounts shown in the Consolidated Statements of Cash Flows (in thousands):
 
 
December 31,
 
 
 
2024
  
2023
  
2022
 
Cash and cash equivalents
  $
173,729    $
213,584    $
132,944  
Restricted cash included in other current assets
   
6,806     
2,008     
862  
Restricted cash included in other non-current assets
   
3,624     
3,807     
3,795  
Total cash, cash equivalents, and restricted cash 
    shown in the statements of cash flows
  $
184,159    $
219,399    $
137,601  
Marketable Debt Securities 
All marketable debt securities have been classified as “available-for-sale” and are carried at estimated fair value as determined based upon quoted 
market prices or pricing models for similar securities. Management determines the appropriate classification of its investments at the time of purchase and 
reevaluates such designation as of each balance sheet date. Investments with a maturity of one year or less from the balance sheet date are reported as 
current marketable debt securities and investments with a maturity of greater than one year from the balance sheet date are reported as non-current 
marketable debt securities. Unrealized gains and losses are excluded from earnings and are reported as a component of comprehensive loss. Realized gains 
and losses and declines in fair value judged to be other than temporary, if any, on available-for-sale securities are included in other expense. The cost of 
securities sold is based on the specific-identification method. Interest on investments is included in interest income.
Equity Investments
The Company records investments in equity securities, other than equity method investments, at fair market value, using market quotes when readily 
determinable. Equity securities with no readily determinable fair values are recorded using the measurement alternative of cost adjusted for observable 
price changes in orderly transactions for identical or similar investments of the same issuer less impairment, if any. Investments in equity securities are 
recorded in other assets on the Company's Consolidated Balance Sheets. Unrealized gains and losses are reported in change in fair value of equity 
investments on the Company’s Consolidated Statements of Operations. The Company regularly reviews its non-marketable equity securities for indicators of 
impairment.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-11
Concentration of Credit Risk, Credit Losses, and Other Risks and Uncertainties
Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash, cash equivalents, and investments. The 
Company’s cash, cash equivalents, and investments are held by financial institutions that management believes are of high credit quality. The Company’s 
investment policy limits investments to fixed income securities denominated and payable in U.S. dollars such as U.S. government obligations, money market 
instruments and funds, corporate bonds, commercial paper, and asset-backed securities and places restrictions on maturities and concentrations by type and 
issuer. Such deposits may, at times, exceed federally insured limits. The Company has not experienced any losses on its deposits of cash and cash equivalents 
and its accounts are monitored by management to mitigate risk. The Company is exposed to credit risk in the event of default by the financial institutions 
holding its cash and cash equivalents, corporate issuers, and other financial instruments, to the extent recorded in the Consolidated Balance Sheets.
The Company is exposed to credit losses primarily through receivables from customers and collaborators and through its available-for-sale debt 
securities. For trade receivables and other financial instruments, the Company uses a forward-looking expected loss model that recognizes a current period 
charge for losses that are expected to be incurred over the life of the financial instrument.
The Company’s expected loss allowance methodology for the receivables is developed using historical collection experience, current and future 
economic market conditions, a review of the current aging status and financial condition of the entities. Specific allowance amounts are established to record 
the appropriate allowance for customers that have a higher probability of default. Balances are written off when determined to be uncollectible. The 
Company’s expected loss allowance methodology for the debt securities is developed by reviewing the extent of the unrealized loss, the size, term, 
geographical location, and industry of the issuer, the issuers’ credit ratings and any changes in those ratings, as well as reviewing current and future 
economic market conditions and the issuers’ current status and financial condition. 
For available-for-sale debt securities with unrealized losses, the losses are recognized as allowances rather than as reductions in the amortized cost of 
the securities. There was no allowance for losses on available-for-sale debt securities which were attributable to credit risk for the years ended December 31, 
2024 and 2023.
The Company is dependent on third-party manufacturers to supply products for research and development activities in its programs. In particular, the 
Company relies and expects to continue to rely on a small number of manufacturers to supply it with its requirements for the active pharmaceutical 
ingredients and formulated drugs related to these programs. These programs could be adversely affected by a significant interruption in the supply of active 
pharmaceutical ingredients and formulated drugs.
Inventory
The Company values inventory at the lower of cost and net realizable value and determines the cost of inventory using the average-cost method. The 
Company expenses costs associated with the manufacture of product candidates prior to regulatory approval. Inventories consist of currently approved 
products. The Company periodically reviews its inventories for excess amounts or obsolescence and writes down obsolete or otherwise unmarketable 
inventory to its estimated net realizable value. Management determines excess inventory based on expected future demand. Estimates related to future 
demand are sensitive to significant inputs and assumptions such as acceptance by patients and physicians and the availability of formulary coverage and 
adequate reimbursement from private third-party payers for the product.
Property, Plant, and Equipment 
Property, plant, and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization is computed using 
the straight-line method over the estimated useful lives of the respective assets. Depreciation and amortization begins when the asset is placed in service. 
Interest costs incurred during the construction of major capital projects are capitalized until the underlying asset is ready to be placed in service. 
Maintenance and repairs are charged to operations as incurred. Upon sale or retirement of assets, the cost and related accumulated depreciation or 
amortization are removed from the balance sheet and the resulting gain or loss, if any, is reflected in operations. See “Note 4. Balance Sheet Components” 
for further disclosure on the useful lives of property, plant, and equipment.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-12
Intangible Assets
Finite-lived intangibles consist of contractual payments made for certain milestones achieved with collaboration partners. The contractual payments 
are recorded as intangible assets and are amortized over their estimated useful lives. The Company reviews its definite-lived intangible assets when events or 
circumstances may indicate that the carrying value of these assets is not recoverable and exceeds their fair value. The Company measures fair value based on 
the estimated future undiscounted cash flows associated with these assets in addition to other assumptions and projections that the Company deems to be 
reasonable and supportable. 
Indefinite-lived intangibles consist of acquired in-process research and development, or IPR&D. IPR&D assets represent capitalized incomplete 
research projects that the Company acquired through business combinations. Such assets are initially measured at their acquisition date fair values and are 
tested for impairment annually and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. When 
development of the project is complete, which generally occurs when regulatory approval to market a product is obtained, the associated assets will be 
deemed finite-lived and will be amortized over a period that best reflects the economic benefits provided by these assets.
If it is determined that an intangible asset becomes impaired, the carrying value is written down to its fair value with the related impairment charge 
recognized in Consolidated Statements of Operations in the period in which the impairment occurs. The Company has not recorded any impairments of 
intangible assets to date. 
Goodwill
Goodwill represents the excess of purchase price over fair value of net assets acquired in a business combination and is not amortized. Goodwill is 
subject to impairment testing at least annually during the fourth quarter or when a triggering event occurs that could indicate a potential impairment. If it is 
determined that the goodwill becomes impaired, the carrying value is written down to its fair value with the related impairment charge recognized in 
Consolidated Statements of Operations in the period in which the impairment occurs. The Company has not recorded any impairments of goodwill.
Impairment of Long-Lived Assets 
The Company evaluates its long-lived assets, including property and equipment, for impairment whenever events or changes in circumstances 
indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparison of the carrying amount of 
each asset to the future undiscounted cash flows expected to result from the use of the asset and its eventual disposition. If the asset is considered to be 
impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. The Company has 
not recorded material impairment of any long-lived assets.
Accruals of Research and Development Costs 
The Company records accruals for estimated costs of research, preclinical and clinical studies and manufacturing development. These costs are a 
significant component of the Company’s research and development expenses. A substantial portion of the Company’s ongoing research and development 
activities are conducted by third-party service providers, including contract research organizations. The Company accrues the costs incurred under its 
agreements with these third parties based on actual work completed in accordance with agreements established with these third parties. The Company 
determines the actual costs through obtaining information from external service providers as to the progress or stage of completion of the services and the 
agreed-upon fee to be paid for such services.
Liabilities for Sales of Future Royalties
The Company sold the right to receive certain royalty payments from net sales of Crysvita in certain territories to RPI Finance Trust, or RPI, an affiliate 
of Royalty Pharma, and to OCM LS23 Holdings LP, an investment vehicle for Ontario Municipal Employees Retirement System, or OMERS, as further 
described in “Note 11. Liabilities for Sales of Future Royalties.” The Company recorded the liabilities at inception based upon estimated future cash flows 
discounted at a market rate. The liabilities are being amortized using the effective interest method over the estimated life of the applicable arrangement. In 
order to determine the amortization of the liabilities, the Company is required to estimate the total amount of future royalty payments to be received by the 
Company and paid to RPI and OMERS, subject to the capped amount, over the life of the arrangements. The excess of future estimated royalty payments 
(subject to the capped amount) to RPI and OMERS is recorded as non-cash interest expense over the life of the arrangements. Consequently, the Company 
estimates an imputed interest on the unamortized portion of the liabilities and records interest expense relating to the transactions.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-13
The Company periodically assesses the expected royalty payments using a combination of historical results, internal projections and forecasts from 
external sources. To the extent such payments are greater or less than the Company’s initial estimates or the timing of such payments is materially different 
than its original estimates, the Company employs the prospective method to adjust the amortization of the liabilities and the effective interest rate.
Revenue Recognition
Product Sales
The Company sells its approved products through a limited number of distributors. Under Accounting Standards Codification, or ASC, 606, Revenue 
from Contracts with Customers, revenue from product sales is recognized at the point in time when control is transferred to these distributors. The Company 
also recognizes revenue from sales of certain products on a “named patient” basis, which are allowed in certain countries prior to the commercial approval 
of the product. Prior to recognizing revenue, the Company makes estimates of the transaction price, including any variable consideration that is subject to a 
constraint. Amounts of variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of 
cumulative revenue recognized will not occur and when the uncertainty associated with the variable consideration is subsequently resolved. Product sales 
are recorded net of estimated government-mandated rebates and chargebacks, estimated product returns, and other deductions.
Provisions for returns and other adjustments are provided for in the period the related revenue is recorded, as estimated by management. These 
reserves are based on estimates of the amounts earned or to be claimed on the related sales and are reviewed periodically and adjusted as necessary. The 
Company’s estimates of government mandated rebates, chargebacks, estimated product returns, and other deductions depends on the identification of key 
customer contract terms and conditions, as well as estimates of sales volumes to different classes of payors. If actual results vary, the Company may need to 
adjust these estimates, which could have a material effect on earnings in the period of the adjustment.
Collaboration, License, and Royalty Revenue
The Company has certain license and collaboration agreements that are within the scope of ASC 808, Collaborative Agreements, which provides 
guidance on the presentation and disclosure of collaborative arrangements. Generally, the classification of the transactions under the collaborative 
arrangements is determined based on the nature of contractual terms of the arrangement, along with the nature of the operations of the participants. The 
Company records its share of collaboration revenue, net of transfer pricing related to net sales in the period in which such sales occur, if the Company is 
considered as an agent in the arrangement. The Company is considered an agent when the collaboration partner controls the product before transfer to the 
customers and has the ability to direct the use of and obtain substantially all of the remaining benefits from the product. Funding received related to 
research and development services and commercialization costs is generally classified as a reduction of research and development expenses and selling, 
general and administrative expenses, respectively, in the Consolidated Statements of Operations, because the provision of such services for collaborative 
partners are not considered to be part of the Company’s ongoing major or central operations.
The Company utilizes certain information from its collaboration partners to record collaboration revenue, including revenue from the sale of the 
product, associated reserves on revenue, and costs incurred for development and sales activities. For the periods covered in the financial statements 
presented, there have been no material changes to prior period estimates of revenues and expenses. The Company also records royalty revenues under 
certain of the Company’s license or collaboration agreements in exchange for license of intellectual property.
As described in “Note 11. Liabilities for Sales of Future Royalties”, for certain royalty payments from net sales of Crysvita in applicable territories that 
were sold to RPI and OMERS, the Company records the royalty revenue on a prospective basis as non-cash royalty revenue in the Consolidated Statements of 
Operations over the term of the applicable arrangement.
The terms of the Company’s collaboration and license agreements may contain multiple performance obligations, which may include licenses and 
research and development activities. The Company evaluates these agreements under ASC 606, Revenue from Contracts with Customers, to determine the 
distinct performance obligations. The Company analogizes to ASC 606 for the accounting for distinct performance obligations for which there is a customer 
relationship. Prior to recognizing revenue, the Company makes estimates of the transaction price, including variable consideration that is subject to a 
constraint. Amounts of variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of 
cumulative revenue recognized will not occur and when the uncertainty associated with the variable consideration is subsequently resolved. Total 
consideration may include nonrefundable upfront license fees, payments for research and 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-14
development activities, reimbursement of certain third-party costs, payments based upon the achievement of specified milestones, and royalty payments 
based on product sales derived from the collaboration.
If there are multiple distinct performance obligations, the Company allocates the transaction price to each distinct performance obligation based on 
its relative standalone selling price. The standalone selling price is generally determined based on the prices charged to customers or using expected cost-
plus margin. The Company estimates the efforts needed to complete the performance obligations and recognizes revenue by measuring the progress 
towards complete satisfaction of the performance obligations using input measures.
Deferred Compensation Plan
The Company maintains a nonqualified deferred compensation plan whereby certain employees and members of the board of directors are able to 
defer certain equity awards and other compensation. Amounts deferred are invested into shares of the Company's common stock and corporate-owned life 
insurance. The plan complies with the provisions of Section 409A of the Internal Revenue Code. All the investments held in the plan are recorded in other 
non-current assets in the Consolidated Balance Sheets. The short-term portion of the corresponding liability for the plan is included in accrued expenses. The 
long-term portion of the liability is included in other non-current liabilities in the Consolidated Balance Sheets. Changes in the value of the deferred 
compensation assets and liabilities are recorded in earnings as they occur. Certain equity awards deferred under the plan are required to be settled through 
the issuance of Company stock. These awards are recorded as treasury stock and deferred compensation obligation within stockholders’ equity.
Leases 
Lease agreements are evaluated to determine whether an arrangement is or contains a lease in accordance with ASC 842, Leases. The Company 
determines if an arrangement includes a lease at inception. Right-of-use lease assets and lease liabilities are recognized based on the present value of the 
future minimum lease payments over the lease term at the commencement date. The right-of-use lease asset includes any lease payments made and 
excludes lease incentives. Incremental borrowing rate is used in determining the present value of future payments. The Company applies a portfolio 
approach to the property leases to apply an incremental borrowing rate to leases with similar lease terms. The lease terms may include options to extend or 
terminate the lease. The Company recognizes the options to extend the lease as part of the right-of-use lease assets and lease liabilities only if it is 
reasonably certain that the option would be exercised. Lease expense for minimum lease payments is recognized on a straight-line basis over the non-
cancelable lease term. The Company has elected to not separate lease and non-lease components. See “Note 10. Leases” for further disclosure.
Comprehensive Loss 
Comprehensive loss is the change in stockholders’ equity from transactions and other events and circumstances other than those resulting from 
investments by stockholders and distributions to stockholders. The Company’s other comprehensive loss is comprised of unrealized gains and losses on 
investments in available-for-sale securities and foreign currency translation adjustments. 
Research and Development 
Research and development costs are expensed as incurred and consist of salaries and benefits, stock-based compensation expense, lab supplies and 
facility costs, as well as fees paid to other nonemployees and entities that conduct certain research and development activities on the Company’s behalf. 
Amounts incurred in connection with license agreements are also included in research and development expense. Nonrefundable advance payments for 
goods or services to be received in the future for use in research and development activities are deferred. The deferred amounts are expensed as the related 
goods are delivered or the services are performed. 
Stock-Based Compensation 
Stock-based awards issued to employees, including stock options, performance stock options, or PSOs, restricted stock units, or RSUs, and 
performance stock units, or PSUs are recorded at fair value as of the grant date and recognized as expense on a straight-line basis over the employee’s 
requisite service period (generally the vesting period). PSOs and PSUs vest only if certain specified criteria are achieved and the employees’ continued service 
requirements are met; therefore, the expense recognition occurs when the likelihood of the PSOs and PSUs being earned is deemed probable. Stock 
compensation expense on awards expected to vest is recognized net of estimated forfeitures. 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-15
Income Taxes 
The Company uses the liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on 
the differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be 
in effect when the differences are expected to reverse. The Company must then assess the likelihood that the resulting deferred tax assets will be realized. A 
valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. Due to the Company’s lack 
of earnings history, the net deferred tax assets have been fully offset by a valuation allowance. 
In conjunction with the acquisition of Dimension Therapeutics, Inc., or Dimension, a deferred tax liability was recorded reflecting the tax impact of the 
difference between the book basis and tax basis of acquired IPR&D. Such deferred income tax liability is not used to offset deferred tax assets when analyzing 
the Company’s valuation allowance as the acquired IPR&D is considered to have an indefinite life until the Company completes or abandons development of 
the acquired IPR&D.
The Company recognizes benefits of uncertain tax positions if it is more likely than not that such positions will be sustained upon examination based 
solely on their technical merits, as the largest amount of benefit that is more likely than not to be realized upon the ultimate settlement. The Company’s 
policy is to recognize interest and penalties related to the underpayment of income taxes as a component of income tax expense or benefit. To date, there 
have been no interest or penalties charged in relation to the unrecognized tax benefits. 
Foreign Currency
Assets and liabilities of non-U.S. subsidiaries that operate in a local currency environment, where the local currency is the functional currency, are 
translated to U.S. dollars at exchange rates in effect at the balance sheet date, with the resulting translation adjustments directly recorded to a separate 
component of accumulated other comprehensive loss. Income and expense accounts are translated at average exchange rates for the period. Transactions 
which are not in the functional currency of the entity are remeasured into the functional currency and gains or losses resulting from the remeasurement 
recorded in other expense. 
Net Loss per Share 
Basic net loss per share is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding during the 
period, without consideration for common stock equivalents. Shares of common stock into which pre-funded warrants may be exercised are considered 
outstanding for the purposes of computing basic net loss per share because the shares may be issued for little or no consideration, are fully vested and are 
exercisable after the original issuance date. Diluted net loss per share is the same as basic net loss per share, since the effects of potentially dilutive securities 
are antidilutive. In periods when we have incurred a net loss, options and warrants to purchase common stock are considered common stock equivalents, 
but have been excluded from the calculation of diluted net loss per share, as their effect is antidilutive.
Recent Accounting Pronouncements
In November 2024, the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 
220-40): Disaggregation of Income Statement Expenses, requiring public entities to disclose additional information about specific expense categories in the 
notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim 
periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting ASU 2024-03.
In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, requiring public 
entities to disclose information about their reportable segments’ significant expenses and other segment items on an interim and annual basis. Public entities 
with a single reportable segment are required to apply the disclosure requirements in ASU 2023-07, as well as all existing segment disclosures and 
reconciliation requirements in ASC 280 on an interim and annual basis. The Company adopted ASU 2023-07 during the year ended December 31, 2024.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-16
3.
Fair Value Measurements 
Certain financial assets and liabilities are recorded at fair value. The carrying amount of certain financial instruments, including cash and cash 
equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their relatively short maturities. The carrying 
amounts of liabilities for the sales of future royalties also approximate their fair value. Assets and liabilities recorded at fair value on a recurring basis in the 
balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the 
exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for 
the asset or liability in an orderly transaction between market participants on the measurement date. The authoritative guidance on fair value measurements 
establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows: 
Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date; 
Level 2—Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or 
similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for 
substantially the full term of the related assets or liabilities; and 
Level 3—Unobservable inputs that are significant to the measurement of the fair value of the assets or liabilities that are supported by little or no 
market data. 
The Company’s financial instruments consist of Level 1, Level 2, and Level 3 assets. Where quoted prices are available in an active market, securities 
are classified as Level 1. Money market funds and U.S. Government treasury bills are classified as Level 1. Level 2 assets consist primarily of corporate bonds, 
asset backed securities, commercial paper, U.S. Government Treasury and agency securities, and debt securities in government-sponsored entities based 
upon quoted market prices for similar movements in active markets, quoted prices for identical or similar instruments in markets that are not active and 
model-based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for 
substantially the full term of the assets. Where applicable these models project future cash flows and discount the future amounts to a present value using 
market-based observable inputs obtained from various third-party data providers, including but not limited to, benchmark yields, interest rate curves, 
reported trades, broker/dealer quotes and reference data.
The Company determines the fair value of its equity investment in Solid Biosciences, Inc., or Solid, by using the quoted market prices, which are Level 
1 fair value measurements.
The following tables set forth the fair value of the Company’s financial assets remeasured on a recurring basis based on the three-tier fair value 
hierarchy (in thousands): 
 
 
December 31, 2024
 
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial Assets:
     
     
     
   
Money market funds
$
113,894     $
—     $
—     $
113,894  
Time deposits
 
—      
10,000      
—      
10,000  
Corporate bonds
 
—      
391,731      
—      
391,731  
Commercial paper
 
—      
21,194      
—      
21,194  
Asset-backed securities
 
—      
143      
—      
143  
U.S. Government Treasury and agency securities
 
—      
158,814      
—      
158,814  
Investment in Solid common stock
 
2,089      
—      
—      
2,089  
Deferred compensation assets
 
—      
15,337      
—      
15,337  
Total financial assets
$
115,983     $
597,219     $
—     $
713,202  
 
     
     
     
   
Financial Liabilities:
     
     
     
   
Deferred compensation liabilities
$
—     $
15,756     $
—     $
15,756  
 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-17
 
December 31, 2023
 
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial Assets:
     
     
     
   
Money market funds
$
162,289     $
—     $
—     $
162,289  
Certificates of deposit and time deposits
 
—      
17,986      
—      
17,986  
Corporate bonds
 
—      
215,166      
—      
215,166  
Commercial paper
 
—      
20,620      
—      
20,620  
Asset-backed securities
 
—      
2,712      
—      
2,712  
U.S. Government Treasury and agency securities
 
57,437      
259,605      
—      
317,042  
Investment in Solid common stock
 
3,204      
—      
—      
3,204  
Deferred compensation assets
 
—      
10,220      
—      
10,220  
Total financial assets
$
222,930     $
526,309     $
—     $
749,239  
 
     
     
     
   
Financial Liabilities:
     
     
     
   
Deferred compensation liabilities
$
—     $
10,365     $
—     $
10,365  
Deferred compensation liabilities consist of short-term liabilities of $0.6 million and $0.2 million as of December 31, 2024 and 2023, respectively, 
included in accrued liabilities on the Consolidated Balance Sheets, and long-term liabilities of $15.2 million and $10.1 million as of December 31, 2024 and 
2023, respectively, included in other non-current liabilities on the Consolidated Balance Sheets. There have been no significant net gains or losses on 
deferred compensation assets or liabilities for the periods presented.
4.
Balance Sheet Components 
Cash Equivalents and Marketable Debt Securities
The fair values of cash equivalents and marketable debt securities classified as available-for-sale securities consisted of the following (in thousands):
 
December 31, 2024
 
 
Amortized
   
Gross Unrealized
   
Estimated
 
 
Cost
   
Gains
   
Losses
   
Fair Value
 
Money market funds
$
113,894     $
—     $
—     $
113,894  
Time deposits
 
10,000      
—      
—      
10,000  
Corporate bonds
 
391,124      
809      
(202 )    
391,731  
Commercial paper
 
21,194      
—      
—      
21,194  
Asset-backed securities
 
143      
—      
—      
143  
U.S. Government Treasury and agency securities
 
158,414      
404      
(4 )    
158,814  
Total
$
694,769     $
1,213     $
(206 )   $
695,776  
 
 
 
December 31, 2023
 
 
Amortized
   
Gross Unrealized
   
Estimated
 
 
Cost
   
Gains
   
Losses
   
Fair Value
 
Money market funds
$
162,289     $
—     $
—     $
162,289  
Certificates of deposit and time deposits
 
17,986      
—      
—      
17,986  
Corporate bonds
 
214,792      
711      
(337 )    
215,166  
Commercial paper
 
20,620      
—      
—      
20,620  
Asset-backed securities
 
2,715      
—      
(3 )    
2,712  
U.S. Government Treasury and agency securities
 
316,160      
982      
(100 )    
317,042  
Total
$
734,562     $
1,693     $
(440 )   $
735,815  
At December 31, 2024, the remaining contractual maturities of available-for-sale securities were less than three years. There have been no significant 
realized gains or losses on available-for-sale securities for the periods presented. All marketable securities with unrealized losses at December 31, 2024 have 
been in a loss position for less than 12 months or the loss is not material and is temporary in nature.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-18
Inventory
Inventory consists of the following (in thousands): 
 
 
December 31,
 
 
 
2024
  
2023
 
Work-in-process
  $
21,967    $
18,859  
Finished goods
   
23,040     
15,110  
Total inventory
  $
45,007    $
33,969  
Property, Plant, and Equipment, net 
Property, plant, and equipment, net consists of the following (in thousands):
 
 
   
 
December 31,
 
 
 
Useful life (years)  
2024
   
2023
 
Building
 
20-30
  $
181,576     $
181,356  
Leasehold improvements
 
Shorter of lease 
term or estimated 
useful life
   
58,021  
 
 
58,683  
Research and development equipment
 
5
   
60,233      
56,347  
Furniture and office equipment
 
5
   
6,475      
6,419  
Computer equipment and software
 
3-5
   
16,365      
16,196  
Manufacturing equipment
 
5-15
   
37,332      
37,297  
Land
 
Not applicable
   
16,619      
16,619  
Other
 
Varies by asset
   
1,790      
1,050  
Property, plant, and equipment, gross
   
   
378,411      
373,967  
Less: accumulated depreciation
   
   
(112,482 )   
(83,401 )
Property, plant, and equipment, net
   
  $
265,929     $
290,566  
Depreciation expense for the years ended December 31, 2024, 2023, and 2022 was $30.1 million, $22.2 million and $15.0 million, respectively. 
Amortization of leasehold improvements and software is included in depreciation expense.
Accrued Liabilities 
Accrued liabilities consists of the following (in thousands): 
 
 
 
December 31,
 
 
 
2024
  
2023
 
Research, clinical study, and manufacturing expenses
  $
88,133    $
65,326  
Payroll and related expenses
   
94,021     
82,936  
Revenue related reserves
   
33,344      
17,029  
Other
   
25,475     
31,195  
Total accrued liabilities
  $
240,973    $
196,486  
 
5.
Intangible Assets, net 
Indefinite-lived Intangibles
As a result of the accounting for our acquisition of Dimension Therapeutics, Inc. in November 2017, the Company has IPR&D assets of $129.0 million 
as of December 31, 2024 and 2023. IPR&D assets represent the fair value of acquired programs to develop an AAV gene therapy for OTC deficiency and to 
develop an AAV gene therapy for glycogen storage disease type Ia. IPR&D assets are considered to be indefinite-life until the completion or abandonment of 
the associated research and development efforts.
Finite-lived Intangibles

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-19
Subsequent to the FDA approval of Dojolvi for the treatment of LC-FAOD in 2020, the Company recorded $4.8 million for the attainment of various 
development and commercial milestones as finite-lived intangible assets which are amortized over a weighted-average total useful life of 6 years.
In January 2022, the Company announced a collaboration with Regeneron to commercialize Evkeeza for HoFH outside of the U.S. Pursuant to the 
collaboration agreement, the Company has incurred an upfront payment and regulatory and sales milestones to date totaling $57.5 million. As these 
payments are for the Company’s use of intellectual property for Evkeeza for HoFH, they were recorded as intangible assets, which are amortized over a 
weighted-average total useful life of 9 years.
The Company's intangible assets were as follows:
 
December 31, 2024
 
 
Gross Carrying 
Amount
 
 
Weighted-
Average Life 
(Years)
 
 
Accumulated 
Amortization  
 
Net Carrying 
Amount
 
Indefinite-lived intangibles
$
129,000      
—     $
—     $
129,000  
Finite-lived intangibles
 
62,275      
9      
(12,961 )   
49,314  
Total intangible assets
$
191,275      
—     $
(12,961 )  $
178,314  
 
 
December 31, 2023
 
 
Gross Carrying 
Amount
 
 
Weighted-
Average Life 
(Years)
 
 
Accumulated 
Amortization  
 
Net Carrying 
Amount
 
Indefinite-lived intangibles
$
129,000      
—     $
—     $
129,000  
Finite-lived intangibles
 
44,775      
10      
(7,504 )   
37,271  
Total intangible assets
$
173,775      
—     $
(7,504 )  $
166,271  
The Company recorded costs of sales of $5.5 million, $3.8 million and $3.2 million for the years ended December 31, 2024, 2023, and 2022, 
respectively, related to the amortization of the intangible assets. 
The expected amortization of the intangible assets, as of December 31, 2024, for each of the next five years and thereafter is as follows:
2025
$
7,162  
2026
 
7,162  
2027
 
6,722  
2028
 
6,282  
2029
 
6,282  
Thereafter
 
15,704  
Total
$
49,314  
 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-20
6.
Revenue
The following table disaggregates total revenues from external customers by product sales, royalty revenue, and collaboration and license revenue (in 
thousands):
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Product sales:
 
   
 
   
 
 
Crysvita
$
134,709  
  $
75,697     $
42,678  
Dojolvi
 
88,194  
   
70,633      
55,612  
Evkeeza
 
32,162  
   
3,642      
—  
Mepsevii
 
30,350  
   
30,441      
20,637  
Total product sales
 
285,415  
   
180,413      
118,927  
Crysvita royalty revenue
 
274,815  
   
182,652      
21,692  
Collaboration and license revenue:
 
   
     
   
Crysvita collaboration revenue in Profit-Share Territory
 
—  
   
69,705  
   
215,024  
Other
 
—  
   
1,479  
   
7,686  
Total collaboration and license revenue
 
—  
   
71,184      
222,710  
Total revenues
$
560,230  
  $
434,249     $
363,329  
The following table disaggregates total revenues based on geographic location (in thousands): 
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
North America
$
340,463  
  $
307,149     $
281,088  
Latin America
 
130,713  
   
77,342      
44,711  
Europe, Middle East, and Africa
 
80,124  
   
47,534      
36,369  
Asia-Pacific
 
8,930  
   
2,224      
1,161  
Total revenues
$
560,230  
  $
434,249     $
363,329  
The following table presents the activity and ending balances for product sales related accruals and allowances (in thousands):
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Balance of product sales reserve at beginning of year
$
17,029  
  $
11,487     $
7,181  
Provisions
 
38,102  
   
18,761      
13,525  
Payments
 
(21,391 )    
(12,746 )    
(9,613 )
Adjustments
 
(434 )    
(473 )    
394  
Balance of product sales reserve at end of year
$
33,306  
  $
17,029     $
11,487  
The following table presents changes in the contract liabilities for the years ended December 31, 2023 (in thousands):
 
December 31,
 
 
2023
 
Balance of contract liabilities at beginning of period
$
1,479  
Additions
 
—  
Deductions
 
(1,479 )
Balance of contract liabilities at end of period, net
$
—  
See “Note 9. License and Research Agreements” for additional details on contract liabilities activities. 
 The Company’s largest accounts receivable balance was from a collaboration partner, KKC, and was 70% and 53% of the total accounts receivable balance as 
of December 31, 2024 and 2023, respectively.
7.
Investment in Amlogenyx. Inc.
In July 2024, the Company contributed certain intellectual property rights to Amlogenyx Inc., or Amlogenyx, a subsidiary of the Company, and 
received 9.0 million shares of common stock of Amlogenyx. A third-party investor along with one of its affiliated entities, and the Company, each contributed 
$7.0 million to Amlogenyx and in exchange, each received approximately 1.6 million 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-21
shares of series seed preferred stock of Amlogenyx. The purpose of Amlogenyx is to pursue the application of the Company’s novel adeno-associated virus, 
or AAV, gene therapy to treat beta-amyloid disorders and related neurodegenerative diseases.
Amlogenyx was determined to be a VIE and the Company is the primary beneficiary as it has the power to direct the activities that would most 
significantly impact the economic performance of Amlogenyx, including the performance of R&D activities relating to its sole product candidate. As the 
primary beneficiary, the Company has consolidated the financial position, results of operations and cash flows of Amlogenyx in its financial statements and 
all intercompany balances have been eliminated in consolidation. Upon initial consolidation, the non-controlling interest of the third-party investor was 
recorded at its estimated fair value of $7.0 million, which is equal to their original investment.
As of December 31, 2024, total assets and liabilities included on the Consolidated Balance Sheets for Amlogenyx were $13.5 million and $0.1 million, 
respectively. The assets primarily consisted of cash and cash equivalents which may only be used to settle obligations of Amlogenyx.
Noncontrolling interest related to the third-party investment in Amlogenyx is reported on the Consolidated Balance Sheets in mezzanine equity. 
Changes in the carrying value of noncontrolling interest for the year ended December 31, 2024, were as follows:
 
Noncontrolling Interest
 
As of December 31, 2023
$
—  
Issuance of equity from noncontrolling interest
 
7,000  
As of December 31, 2024
$
7,000  
In October 2024, Amlogenyx granted 778,500 stock options to its employees from its 2024 Equity Incentive Plan, which authorizes 1,358,060 shares 
for issuance. For the year ended December 31, 2024, stock-based compensation related to these awards was immaterial.
8.
GeneTx Acquisition
In August 2019, the Company entered into a Program Agreement and a Unitholder Option Agreement with GeneTx Biotherapeutics LLC, or GeneTx, to 
collaborate on the development of GeneTx’s GTX-102, an ASO for the treatment of Angelman syndrome. In July 2022, pursuant to the terms of the 
Unitholder Option Agreement, as amended, the Company exercised the option to acquire GeneTx and entered into a Unit Purchase Agreement, or the 
Purchase Agreement, pursuant to which the Company purchased all the outstanding units of GeneTx. In accordance with the terms of the Purchase 
Agreement, the Company paid the option exercise price of $75.0 million and an additional $15.6 million to acquire the outstanding cash of GeneTx, and 
adjustments for working capital and transaction expenses of $0.6 million, for a total purchase consideration of $91.2 million. During the year ended 
December 31, 2024, the Company achieved a $30.0 million regulatory milestone upon the initiation of the Phase 3 Aspire clinical study for GTX-102. The 
Company is obligated to pay up to $85.0 million in additional regulatory approval milestones for the achievement of U.S. and EU product approvals, and up 
to $75.0 million in commercial milestone payments based on annual worldwide net product sales, contingent upon the achievement of the milestones. The 
Company will also pay tiered mid- to high single-digit percentage royalties based on licensed product annual net sales. If the Company receives and resells an 
FDA priority review voucher, or PRV, in connection with a new drug application approval, GeneTx unitholders are entitled to receive a portion of proceeds 
from the sale or a cash payment from the Company if the Company choses to retain the PRV. 
As part of the Company's acquisition of GeneTx, the Company assumed a License Agreement with Texas A&M University, or TAMU. To date, the 
Company recognized an aggregate of $0.5 million for clinical milestones under the TAMU agreement, and have in aggregate up to $23.0 million of future 
obligations for various future milestones and a nominal annual license fee that may increase up to a maximum of $2.0 million. The Company will also pay 
mid-single-digit percentage royalties based on licensed product annual net sales. As of December 31, 2024 and 2023, the Company had $0.5 million and nil, 
respectively, in collaboration payables under this arrangement.
The transaction was accounted as an asset acquisition, as substantially all of the fair value of the gross assets acquired was concentrated in a single 
identifiable in-process research and development intangible asset. Prior to the achievement of certain development and regulatory milestones, the acquired 
in-process research and development intangible asset has not yet reached technological feasibility and has no alternative future use. Accordingly, to date, 
amounts paid to acquire GeneTx, net of cash and working capital acquired, were classified as in-process research and development expense.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-22
9.
License and Research Agreements
Kyowa Kirin Co., Ltd.
In August 2013, the Company entered into a collaboration and license agreement with Kyowa Kirin Co., Ltd., or KKC. Under the terms of this 
collaboration and license agreement, as amended, the Company and KKC collaborate on the development and commercialization of Crysvita in the field of 
orphan diseases in the U.S. and Canada, or the Profit-Share Territory, and in the European Union, UK, and Switzerland, or the European Territory, and the 
Company has the right to develop and commercialize such products in the field of orphan diseases in Mexico and Central and South America, or Latin 
America.
The collaboration and license agreements are within the scope of ASC 808, which provides guidance on the presentation and disclosure of 
collaborative arrangements.
Product Sales Revenue for Latin America and Turkey
The Company is responsible for commercializing Crysvita in Latin America and Turkey. The Company is considered the principal in these territories as 
the Company controls the product before it is transferred to the customer. Accordingly, the Company records revenue on a gross basis for the sale of Crysvita 
once the product is delivered and the risk and title of the product is transferred to the distributor. In Turkey, KKC has the option to assume responsibility for 
commercialization efforts.
Transfer Price and Royalties on Product Sales Revenue
Under the collaboration agreement, KKC manufactures and supplies Crysvita, which is purchased by the Company for sales in Latin America and 
Turkey, and charges the Company a transfer price of 30% of net sales. The transfer price on these sales was 35% prior to December 31, 2022. The Company 
also pays to KKC a low single-digit royalty on net sales in Latin America.
Collaboration and Royalty Revenue for Sales in the Profit-Share Territory
The Company and KKC shared commercial responsibilities and profits in the Profit-Share Territory until April 2023. Under the collaboration 
agreement, KKC manufactured and supplied Crysvita for commercial use in the Profit-Share Territory and charged the Company a transfer price of 30% of net 
sales in 2023, and 35% prior to December 31, 2022. The remaining profit or loss after supply costs from commercializing products in the Profit-Share Territory 
was shared between the Company and KKC on a 50/50 basis until April 2023. In April 2023, commercialization responsibilities for Crysvita in the Profit-Share 
Territory transitioned to KKC. Thereafter, the Company is entitled to receive a tiered double-digit revenue share from the mid-20% range up to a maximum 
rate of 30%.
The parties subsequently agreed that the Company would have the right to continue to support KKC in commercial field activities in the U.S. through 
January 31, 2025, as amended. After January 31, 2025, the Company’s rights to promote Crysvita in the U.S. are limited to medical geneticists and the 
Company solely bears its expenses for the promotion of Crysvita in the Profit-Share Territory. 
During the prior profit-share period, as KKC was the principal in the sale transaction with the customer, the Company recognized a pro-rata share of 
collaboration revenue, net of transfer pricing, in the period the sale occurred. The Company concluded that its portion of KKC’s sales in the Profit-Share 
Territory prior to April 2023 was analogous to a royalty and therefore recorded its share as collaboration revenue, similar to a royalty. Starting in April 2023, 
the Company began to record as royalty revenue in the period the underlying sales occurred. 
In July 2022, the Company sold to OMERS its right to receive 30% of the future royalty payments due to the Company based on net sales of Crysvita in 
the U.S. and Canada, subject to a cap, beginning in April 2023, as further described in “Note 11. Liabilities for Sales of Future Royalties.” 
Royalty Revenue for Sales in the European Territory
KKC has the commercial responsibility for Crysvita in the European Territory. In December 2019, the Company sold its right to receive royalty 
payments based on sales in the European Territory to Royalty Pharma, effective January 1, 2020, as further described in “Note 11. Liabilities for Sales of 
Future Royalties.” Prior to the Company’s sale of the royalty, the Company received a royalty of up to 10% on net sales in the European Territory, which was 
recognized as the underlying sales occur. Beginning in 2020, the Company records the royalty revenue as non-cash royalty revenues. The Company records 
this revenue as royalty revenue.
Total Crysvita revenue was as follows (in thousands):

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-23
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Product sales
$
134,709     $
75,697     $
42,678  
Revenue in profit-share territory:
     
     
   
Royalty revenue
 
174,276      
113,288      
—  
Non-cash royalty revenue
 
74,690      
48,581      
—  
Collaboration revenue
 
—      
69,705      
215,024  
Total revenue in Profit-Share Territory
 
248,966      
231,574      
215,024  
Non-cash royalty revenue in European Territory
 
25,849      
20,783      
21,692  
Total Crysvita revenue
$
409,524     $
328,054     $
279,394  
Development Activities
In the field of orphan diseases, except for ongoing studies being conducted by KKC, the Company was the lead party for development activities in the 
Profit-Share Territory and in the European Territory until the applicable transition date. The Company shared the costs for development activities in the 
Profit-Share Territory and the European Territory conducted pursuant to the development plan before the applicable transition date equally with KKC. In 
April 2023, which was the transition date for the Profit-Share Territory, KKC became the lead party and became responsible for the costs of the subsequent 
development activities. However, the Company will continue to equally share in the costs of the studies with KKC that commenced prior to the applicable 
transition date.
Collaboration Cost Sharing and Payments
Under the collaboration agreement, KKC and the Company share certain development and commercialization costs, and as a result, the Company was 
reimbursed for these costs and operating expenses were reduced. KKC also receives a transfer price and royalty on net product sales revenue which is 
recorded in cost of sales. These amounts were recognized in the Company’s Statements of Operations in connection with the collaboration agreement with 
KKC as follows (in thousands):
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Research and development
$
(3,670 )   $
(6,510 )   $
(15,974 )
Selling, general and administrative
$
(4,082 )   $
(17,199 )   $
(37,217 )
Cost of sales
$
46,027  
  $
18,476  
  $
13,250  
Collaboration Receivable and Payable
The Company had accounts receivable from KKC in the amount of $85.4 million and $39.2 million from profit-share revenue and royalties and other 
receivables recorded in other current assets of $1.8 million and $1.1 million and accrued liabilities of $7.1 million and $5.3 million from amounts owed for 
transfer price and royalties as well as commercial and development activity reimbursements, as of December 31, 2024 and 2023, respectively.
Baylor Research Institute 
In September 2012, the Company entered into a license agreement with Baylor Research Institute, or BRI. Under the terms of this license agreement, 
as amended, BRI exclusively licensed to the Company its territories for certain intellectual property related to Dojolvi for the treatment of LC-FAOD.
During the year ended December 31, 2022, the Company recorded $2.5 million for the attainment of a commercial milestone as a finite-lived 
intangible asset. The Company is obligated to make additional future payments of up to $7.5 million contingent upon attainment of various development and 
commercial milestones. Additionally, the Company pays BRI a mid- single-digit royalty on net sales of the licensed product in the licensed territories. 
Regeneron
In January 2022, the Company announced a collaboration with Regeneron to commercialize Evkeeza for HoFH outside of the U.S. Pursuant to the 
terms of the agreement, the Company received the rights to develop, commercialize and distribute the product for HoFH in countries outside of the U.S. The 
Company paid Regeneron a $30.0 million upfront payment. As of December 31, 2024 the Company has recognized an aggregate of $27.5 million for 
regulatory and sales milestones under the agreement, of which $15.0

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-24
 million was achieved during the year ended December 31, 2024. As these payments are for the Company’s use of intellectual property for Evkeeza for HoFH, 
they were recorded as intangible assets. See "Note 5. Intangible Assets, net" for additional details. Going forward, the Company is obligated to pay 
Regeneron up to an aggregate of $35.5 million of future obligations for additional regulatory and sales milestones, if achieved. The Company may share in 
certain costs for global trials led by Regeneron and also received the right to opt into other potential indications. Additionally, the Company pays Regeneron 
a transfer price fee and royalties on certain revenues.
The collaboration agreement is within the scope of ASC 808 which provides guidance on the presentation and disclosure of collaborative 
arrangements. As the Company is the principal in sales transactions with the customer, the Company recognizes product sales and cost of sales in the period 
the related sales occur and the related revenue recognition criteria are met. Under the collaboration agreement, Regeneron supplies the product and 
charges the Company a transfer price from the low 20% range up to 40% on net sales, which is recognized as cost of sales in the Company’s Statement of 
Operations.
Under the collaboration agreement, Regeneron and the Company share certain development and commercialization costs. Regeneron also receives a 
transfer price and royalty on net product sales revenue which is recorded in cost of sales. These amounts were recognized in the Company’s Statements of 
Operations in connection with the collaboration agreement with Regeneron as follows (in thousands):
 
Year Ended December 31,
 
 
2024
   
2023
   
2022
 
Research and development
$
(2,842 )   $
7,629  
  $
7,258  
Cost of sales
$
8,030  
  $
684  
  $
—  
The Company had collaboration payables for this arrangement included in accrued liabilities on the Consolidated Balance Sheets of $17.8 million and 
$10.6 million as of December 31, 2024 and December 31, 2023, respectively.
Saint Louis University
In November 2010, the Company entered into a license agreement with Saint Louis University, or SLU. Under the terms of this license agreement, SLU 
granted the Company an exclusive worldwide license to make, have made, use, import, offer for sale, and sell therapeutics related to SLU’s beta-
glucuronidase product for use in the treatment of human diseases. 
Under the license agreement, the Company is obligated to pay to SLU a low single-digit royalty on net sales of the licensed products in Europe and 
Japan, subject to certain potential deductions. The Company's obligation to pay royalties to SLU in these territories continues until the expiration of any 
orphan drug exclusivity.
Abeona
In May 2022, the Company announced an exclusive License Agreement for the AAV gene therapy for UX111 with Abeona for the treatment of MPS 
IIIA. Under the terms of the agreement, the Company assumed responsibility for the UX111 program and in return, the Company is obligated to pay tiered 
royalties of up to 10% on net sales and commercial milestone payments of up to $30.0 million contingent upon regulatory approval of the product. 
Additionally, the Company entered into an Assignment and Assumption Agreement with Abeona to transfer and assign to the Company the exclusive license 
agreement between Nationwide Children’s Hospital, or NCH, and Abeona for certain rights related to UX111. Under this agreement, the Company is 
obligated to pay up to $1.0 million contingent upon achievement of development and regulatory milestones as well as royalties in the low single-digits of net 
sales.
The Company paid Abeona $3.1 million for prior development and transition costs which were recorded as research and development expense for the 
year ended December 31, 2022.
Mereo
In December 2020, the Company entered into a License and Collaboration Agreement with Mereo to collaborate on the development of setrusumab. 
Under the terms of the agreement, as amended, the Company will lead future global development of setrusumab in both pediatric and adult patients with 
OI. The Company was granted an exclusive license to develop and commercialize setrusumab in the U.S., Turkey, and the rest of the world, or the Ultragenyx 
Territory, excluding the EEA, UK, and Switzerland, or the Mereo Territory, where Mereo retains commercial rights. Each party will be responsible for post-
marketing 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-25
commitments in their respective territories and Ultragenyx will be responsible for commercial supply in both the Ultragenyx Territory and Mereo Territory.
Upon the closing of the transactions under the License and Collaboration Agreement with Mereo in January 2021, the Company made a payment of 
$50.0 million to Mereo. To date, the Company has made payments totaling $9.0 million for regulatory milestones achieved. The Company is obligated to pay 
Mereo up to $245.0 million in future milestone payments, contingent upon the achievement of certain regulatory and commercial milestones. The Company 
pays for all global development costs and will pay a tiered double-digit percentage royalties to Mereo on net sales in the Ultragenyx Territory. Mereo will pay 
the Company a fixed double-digit percentage royalty on net sales in the Mereo Territory. If the Company receives and resells an FDA PRV in connection with 
a new drug application approval, Mereo is entitled to receive a portion of proceeds from the sale of the PRV or a cash payment from the Company, in the 
event the Company chooses to retain the PRV. 
In December 2024, the Company entered into a manufacturing and supply agreement with Mereo where it is responsible for the supply of 
setrusumab to Mereo in the Mereo territory. Mereo is responsible to reimburse us for a portion of the manufacturing process development costs as well as 
future commercial supply costs.
Although Mereo is a VIE, the Company is not the primary beneficiary as it does not have the power to direct the activities that would most 
significantly impact the economic performance of Mereo. Prior to the achievement of certain development milestones, all consideration paid to Mereo 
represents rights to potential future benefits associated with Mereo’s in-process research and development activities, which have not reached technological 
feasibility and have no alternative future use. 
For the year ended December 31, 2024, the Company recorded an offset to research and development expense of $0.9 million. For the year ended 
December 31, 2023, the Company recorded development costs of $9.0 million for the achievement of a clinical milestone recorded in research and 
development expense.
University of Pennsylvania
The Company has a research, collaboration, and license agreement with University of Pennsylvania School of Medicine, or Penn, which provides the 
terms for the Company and Penn to collaborate with respect to the pre-clinical development of gene therapy products for the treatment of certain 
indications. Under the agreement, Penn granted the Company an exclusive, worldwide license to certain patent rights arising out of the research program, 
subject to certain retained rights, and a non-exclusive, worldwide license to certain Penn intellectual property, in each case to research, develop, make, have 
made, use, sell, offer for sale, commercialize and import licensed products in each indication for the term of the agreement. The Company will fund the cost 
of the research program in accordance with a mutually agreed-upon research budget and will be responsible for clinical development, manufacturing and 
commercialization of each indication. The Company is obligated to make milestone payments of up to $5.0 million for each indication, if certain development 
milestones are achieved. The Company is also obligated to make milestone payments of up to $25.0 million per approved product, if certain commercial 
milestones are achieved, as well as low to mid- single-digit royalties on net sales of each licensed product.
REGENXBIO, Inc.
The Company has a license agreement with REGENXBIO, Inc., or REGENX, for an exclusive, sublicensable, worldwide commercial license under certain 
intellectual property for preclinical and clinical research and development, and commercialization of drug therapies using REGENX's licensed patents for the 
treatment of OTC deficiency and GSD1a. The Company will pay an annual fee and certain milestone fees per disease indication, low to mid- single-digit 
royalty percentages on net sales of licensed products, and milestone and sublicense fees owed by REGENX to its licensors, which are contingent upon the 
attainment of certain development activities as outlined in the agreement.
The Company also has an option and license agreement with REGENX under which the Company has an exclusive, sublicensable, worldwide license to 
make, have made, use, import, sell, and offer for sale licensed products to treat Wilson disease and CDKL5 deficiency. For each disease indication, the 
Company is obligated to pay a nominal annual maintenance fee and up to $9.0 million upon achievement of various milestones, as well as mid- to high single-
digit royalties on net sales of licensed products and mid- single-digit to low double-digit percentage sublicenses fees, if any. 
In March 2020, the Company entered into a license agreement with REGENX, for an exclusive, sublicensable, worldwide license to REGENX’s NAV 
AAV8 and AAV9 vectors for the development and commercialization of gene therapy treatments for a rare metabolic disorder. In return for these rights, the 
Company made an upfront payment of $7.0 million. The Company is obligated to pay nominal annual fees, milestone payments of up to $14.0 million 
contingent upon achievement, and royalties on any net sales of products incorporating the licensed intellectual property that range from a high single-digit 
to low double-digit royalty.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-26
Solid Biosciences, Inc.
In October 2020, the Company entered into a strategic Collaboration and License Agreement with Solid Biosciences Inc., or Solid, and received an 
exclusive license for any pharmaceutical product that expresses Solid’s proprietary microdystrophin construct from AAV8 and variants thereof in clade E for 
use in the treatment of Duchenne muscular dystrophy and other diseases resulting from lack of functional dystrophin, including Becker muscular dystrophy. 
The Company is collaborating to develop products that combine Solid’s differentiated microdystrophin construct, the Company’s Pinnacle PCL Platform, and 
the Company’s AAV8 variants. Solid is providing development support and was granted an exclusive option to co-invest in products the Company develops 
for profit-share participation in certain territories. On a product-by-product basis, the Company is obligated to make development milestone payments of up 
to $25.0 million, regulatory milestone payments of up to $65.0 million, and commercial milestone payments of up to $165.0 million, if such milestones are 
achieved, as well as royalties on any net sales of products incorporating the licensed intellectual property that range from a low to mid-double-digit 
percentage. The royalty rate changes to mid- to high double-digit percentage if Solid decides to co-invest in the product.
The Company also entered into a Stock Purchase Agreement and the Investor Agreement with Solid, pursuant to which the Company holds 521,719 
shares of Solid's common stock. The Company’s investment in Solid is being accounted at fair value, as the fair value is readily determinable. The Company 
recorded the common stock investment at $26.8 million on the transaction date, which was based on the quoted market price on the closing date.
Although Solid is a VIE, the Company is not the primary beneficiary as it does not have the power to direct the activities that would most significantly 
impact the economic performance of Solid. Prior to the achievement of certain development milestones, all consideration paid to Solid represents rights to 
potential future benefits associated with Solid’s in-process research and development activities, which have not reached technological feasibility and have no 
alternative future use. Accordingly, the remaining $13.2 million of the total $40.0 million paid as consideration was attributed to the license rights obtained 
and was recorded as in-process research and development expense during the year ended December 31, 2020.
The changes in the fair value of the Company’s investment in Solid’s common stock were as follows (in thousands):
 
Solid Common Stock
 
December 31, 2022
$
2,807  
Change in fair value
 
397  
December 31, 2023
 
3,204  
Change in fair value
 
(1,115 )
December 31, 2024
$
2,089  
Arcturus Therapeutics Holdings Inc.
The Company previously held an investment in shares of common stock from Arcturus Therapeutics Holdings Inc., or Arcturus, which was accounted 
at fair value, as the fair value was readily determinable. During the year ended December 31, 2022, the Company sold 500,000 shares of Arcturus common 
stock, at a weighted-average price of $20.39 per share. As of December 31, 2024 and 2023, the Company held no shares of Arcturus common stock.
The changes in the fair value of the Company’s equity investment in Arcturus were as follows (in thousands):
 
Arcturus Common Stock
 
December 31, 2021
$
18,505  
Change in fair value
 
(8,411 )
Sale of shares
 
(10,094 )
December 31, 2022
$
—  
 
10.
Leases
The Company leases office space and research, testing and manufacturing laboratory space in various facilities in Novato and Brisbane, California, in 
Somerville and Woburn, Massachusetts, and in certain foreign countries, under operating agreements expiring at various dates through 2029. Certain lease 
agreements include options for the Company to extend the lease for multiple renewal periods and provide for annual minimum increases in rent, usually 
based on a consumer price index or annual minimum increases. None of these optional periods have been considered in the determination of the right-of-
use lease asset or the lease liability for the leases as the Company did not consider it reasonably certain that it would exercise any such options. The 
Company recognizes lease expense on a straight-line basis over the non-cancelable term of its operating leases. The variable lease expense primarily consists 
of common area maintenance and other operating costs.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-27
The components of lease expense were as follows (in thousands):
 
 
Year Ended December 31,
 
 
 
2024
 
2023
 
2022
 
Operating lease expense
  $
11,985   $
12,883   $
11,775  
Variable lease expense
   
5,893    
5,272    
4,785  
Financing:
   
   
 
   
    Amortization
   
—    
203    
343  
    Interest expense
   
—    
—    
37  
        Total
  $
17,878   $
18,358   $
16,940  
Cash paid for amounts included in the measurement of operating lease liabilities for the years ended December 31, 2024, 2023, and 2022 was $16.1 
million, $13.4 million, and $13.1 million, respectively, and was included in net cash used in operating activities in the Consolidated Statements of Cash Flows.
Right-of-use lease assets were $25.5 million and $23.9 million as of December 31, 2024 and 2023, respectively, and were included in other non-
current assets on the Consolidated Balance Sheets.
The following table summarizes maturities of lease liabilities and the reconciliation of lease liabilities as of December 31, 2024:
Year Ending December 31,
 
Operating
 
2025
 
$
13,831  
2026
 
 
13,949  
2027
 
 
9,019  
2028
 
 
6,709  
2029
 
 
5,589  
Thereafter
 
 
467  
Total future lease payments
 
 
49,564  
Less: Amount representing interest
 
 
(9,225 )
Present value of future lease payments
 
 
40,339  
Less: Lease liabilities, current
 
 
(10,297 )
Lease liabilities, non-current
 
$
30,042  
Lease liabilities are based on the net present value of the remaining lease payments over the remaining lease term. For the years ended December 31, 
2024 and 2023, the weighted-average remaining operating lease terms were 4 years and 5 years, respectively, the weighted-average discount rates used to 
determine the lease liability for operating leases were 10.1% and 9.6%, respectively.
11.
Liabilities for Sales of Future Royalties
In December 2019, the Company entered into a Royalty Purchase Agreement with RPI. Pursuant to the agreement, RPI paid $320.0 million to the 
Company in consideration for the right to receive royalty payments effective January 1, 2020, arising from the net sales of Crysvita in the EU, the U.K., and 
Switzerland under the terms of the Company’s Collaboration and License Agreement with KKC dated August 29, 2013, as amended, or the KKC Collaboration 
Agreement. The agreement with RPI will automatically terminate, and the payment of royalties to RPI will cease, in the event aggregate royalty payments 
received by RPI are equal to or greater than $608.0 million prior to December 31, 2030, or in the event aggregate royalty payments received by RPI are less 
than $608.0 million prior to December 31, 2030, or when aggregate royalty payments received by RPI are equal to $800.0 million.
In July 2022, the Company entered into a Royalty Purchase Agreement with OMERS. Pursuant to the agreement, OMERS paid $500.0 million to the 
Company in consideration for the right to receive 30% of the future royalty payments due to the Company from KKC based on net sales of Crysvita in the U.S. 
and Canada under the terms of the KKC Collaboration Agreement. The calculation of royalty payments to OMERS is based on net sales of Crysvita beginning 
in April 2023 and will expire upon the earlier of the date on which aggregate payments received by OMERS equals $725.0 million or the date the final royalty 
payment is made to the Company under the KKC Collaboration Agreement.
Proceeds from these transactions were recorded as liabilities for sales of future royalties on the Consolidated Balance Sheets. Upon inception of the 
respective arrangements, the Company recorded $320.0 million and $500.0 million, net of transaction costs of $5.8 million and $9.1 million for RPI and 
OMERS, respectively. The Company records the royalty revenue arising from the net sales of Crysvita in the applicable territories as royalty revenue in the 
Consolidated Statements of Operations over the term of the arrangements. Royalties earned under the RPI and OMERS arrangements from inception to 
December 31, 2024

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-28
 have been $99.3 million and $123.3 million, respectively. The Company’s effective annual interest rates were 6.2% and 7.5%, for RPI and OMERS, 
respectively, as of December 31, 2024.
There are a number of factors that could materially affect the amount and timing of royalty payments from KKC in the applicable territories, most of 
which are not within the Company’s control. Such factors include, but are not limited to, the success of KKC’s sales and promotion of Crysvita, changing 
standards of care, macroeconomic and inflationary pressures, the introduction of competing products, pricing for reimbursement in various territories, 
manufacturing or other delays, intellectual property matters, adverse events that result in governmental health authority imposed restrictions on the use of 
Crysvita, significant changes in foreign exchange rates as the royalty payments are made in U.S. dollars, or USD, while significant portions of the underlying 
sales of Crysvita are made in currencies other than USD, and other events or circumstances that could result in reduced royalty payments from sales of 
Crysvita, all of which would result in a reduction of royalty revenue and the non-cash interest expense over the life of the arrangement. Conversely, if sales of 
Crysvita in the relevant territories are more than expected, the royalty revenue and the non-cash interest expense recorded by the Company would be 
greater over the term of the arrangements.
The following table shows the activity within the liability account (in thousands):
 
 
 
 
 
 
 
 
Liabilities for Sales of Future Royalties
 
 
RPI
 
OMERS
 
Total
 
December 31, 2022
$
365,189   $
510,250   $
875,439  
Royalty revenue
 
(20,783 ) 
(38,524 ) 
(59,307 )
Non-cash interest expense
 
32,235    
43,200    
75,435  
December 31, 2023
 
376,641    
514,926    
891,567  
Royalty revenue
 
(25,849 ) 
(59,088 ) 
(84,937 )
Non-cash interest expense
 
23,747    
39,294    
63,041  
December 31, 2024
$
374,539   $
495,132   $
869,671  
 
12.
Equity
At-the-Market Offerings
In February 2024, the Company entered into a Sales Agreement with Cowen and Company, LLC, or Cowen, pursuant to which the Company may offer 
and sell shares of the Company’s common stock having an aggregate offering proceeds up to $350.0 million, from time to time, in at-the-market, or ATM, 
offerings through Cowen. No shares were sold under this agreement during the year ended December 31, 2024.
In May 2021, the Company entered into an Open Market Sale Agreement with Jefferies LLC, or Jefferies, pursuant to which the Company may offer 
and sell shares of the Company’s common stock having an aggregate offering proceeds up to $350.0 million, from time to time, in ATM offerings through 
Jefferies. During the year ended December 31, 2023, there were 1,175,584 shares sold under the ATM resulting in net proceeds of $53.3 million.
Underwritten Public Offering
In June 2024, the Company completed an underwritten public offering in which 8,782,051 shares of common stock were sold, including the exercise in 
full by the underwriters of their option to purchase an additional 1,346,153 shares, at a public offering price of $39.00 per share. In connection with the 
offering, the Company sold to certain investors pre-funded warrants, in lieu of common stock, to purchase 1,538,501 shares of common stock at a purchase 
price of $38.999 per pre-funded warrant, which equals the public offering price per share of common stock less the $0.001 exercise price per share of each 
pre-funded warrant. The total proceeds that the Company received from the offering were $381.0 million, net of underwriting discounts and commissions.
The pre-funded warrants were classified as a component of permanent equity in the Company's Consolidated Balance Sheets as they are freestanding 
financial instruments that are immediately exercisable, do not embody an obligation for the Company to repurchase its own shares and permit the holders to 
receive a fixed number of shares of common stock upon exercise. All of the shares underlying the pre-funded warrants have been included in the weighted-
average number of shares of common stock used to calculate net loss per share, basic and diluted, attributable to common stockholders because the shares 
may be issued for little or no 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-29
consideration, are fully vested, and are exercisable after the original issuance date of the pre-funded warrants. As of December 31, 2024, none of the pre-
funded warrants had been exercised.
The table below summarizes pre-funded warrants activity:
 
Pre-funded warrants
 
As of December 31, 2022
 
—  
Issuance of pre-funded warrants
 
1,666,722  
As of December 31, 2023
 
1,666,722  
Issuance of pre-funded warrants
 
1,538,501  
As of December 31, 2024
 
3,205,223  
In October 2023, the Company completed an underwritten public offering in which 9,833,334 shares of common stock were sold, including the 
exercise in full by the underwriters of their option to purchase an additional 1,500,000 shares, at a public offering price of $30.00 per share. In connection 
with the offering, the Company sold to certain investors pre-funded warrants, in lieu of common stock, to purchase 1,666,722 shares of common stock at a 
purchase price of $29.999 per pre-funded warrant, which equals the public offering price per share of common stock less the $0.001 exercise price per share 
of each pre-funded warrant. The total proceeds that the Company received from the offering were $326.5 million, net of underwriting discounts and 
commissions.
13.
Stock-Based Awards 
Equity Plan Awards
Under the terms of the Company's 2023 Incentive Plan, or 2023 Plan, and Employment Inducement Plan, or Inducement Plan, awards may be granted 
at an exercise price not less than fair market value. The exercise price of an option may not be less than the fair market value. The term of an award granted 
under the 2023 Plan and Inducement Plan may not exceed ten years. Typically, the vesting schedule for option grants to employees provides that 1/4 of the 
grant vests upon the first anniversary of the date of grant, with the remainder of the shares vesting monthly thereafter at a rate of 1/48 of the total shares 
subject to the option. Typically, the vesting schedule for RSU grants provides that 1/4 of the grant vests upon the annual anniversary of the date of grant over 
the period of four years.
Under the 2014 Employee Stock Purchase Plan, or ESPP, eligible employees may purchase common stock at 85% of the lesser of the fair market value 
of common stock on the offering date or the purchase date with a six-month look-back feature. ESPP purchases are settled with common stock from the 
ESPP’s previously authorized and available pool of shares. During the year ended December 31, 2024, the Company issued 200,539 shares of common stock 
under the ESPP.
The table below summarizes the Company's equity plans as of December 31, 2024:
Plan
  Year of Adoption  
Expiration Date, 
as Amended
 
Maximum 
Number of 
Shares 
Authorized
   
Shares Available 
for Future 
Issuance
 
Employment Inducement Plan
 
2021
 
February 3, 2031    
1,200,000      
211,628  
2023 Incentive Plan
 
2023
 
June 7, 2023
   
10,475,837      
6,139,766  
2014 Employee Stock Purchase Plan  
2014
 
June 7, 2033
   
7,330,914      
6,409,256  
(1) Maximum number of shares authorized and shares available for future issuance under the 2023 Incentive Plan include 1,975,837 shares 
subject to the 2014 Incentive Plan cancelled after June 7, 2023.
 
 
(1)

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-30
Stock Option Activity
The following table summarizes activity under the Company’s stock option plans and related information:
 
 
 
Options Outstanding
 
 
 
Number of 
Options
   
Weighted-
Average 
Exercise 
Price
   
Weighted-
Average 
Remaining 
Contractual 
Term (Years)  
Aggregate 
Intrinsic 
Value
(In 
thousands)  
Outstanding — December 31, 2023
   
8,787,712     $
67.43    
6
  $
7,558  
Options granted
   
1,445,364      
52.91    
 
   
 
Options exercised
   
(124,536 )   
46.06    
 
   
 
Options cancelled
   
(747,571 )   
66.68    
 
   
 
Outstanding — December 31, 2024
   
9,360,969      
65.54    
6
   
1839  
Vested and exercisable — December 31, 2024
   
6,360,538      
71.27    
5
   
729  
Vested and expected to vest — December 31, 2024
   
9,096,200      
65.95    
6
   
1,742  
The following table summarizes the Company's options exercised and vested for each of the periods indicated (in thousands except for weighted-
average estimated fair value of options granted):
 
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Intrinsic value of options exercised
  $
862     $
4,950     $
2,552  
Cash received from the exercise of options
  $
5,736     $
2,743     $
6,242  
Weighted-average estimated fair value of options granted
  $
29.88     $
25.53     $
34.77  
Estimated fair value of options vested
  $
53,838     $
59,663     $
58,677  
 
The aggregate intrinsic values of options outstanding, vested and exercisable, and vested and expected to vest were calculated as the difference 
between the exercise price of the options and the fair value of the Company’s common stock.
Performance Stock Options
The following table summarizes activity under the Company’s Performance Stock Option, or PSO, plans and related information:
 
 
 
PSOs Outstanding
 
 
 
Number of 
Options
   
Weighted-
Average 
Exercise 
Price
   
Weighted-
Average 
Remaining 
Contractual 
Term (Years)  
Aggregate 
Intrinsic 
Value
 
Outstanding — December 31, 2023
 
 
1,380,998     $
67.37    
3
  $
—  
PSOs cancelled
   
(135,707 )   
67.37    
 
   
 
Outstanding — December 31, 2024
 
 
1,245,291      
67.37    
2
   
—  
Vested and exercisable — December 31, 2024
   
422,594      
67.37    
2
   
—  
Vested and expected to vest — December 31, 2024
 
 
930,420      
67.37    
2
   
—  
 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-31
During the year ended December 31, 2022, PSOs were granted to certain nonexecutive employees. PSOs are subject to vest only if specified 
operational milestones are achieved and the employees’ continued service with the Company. The Company uses the Black-Scholes method to calculate the 
fair value at the grant date and is recognizing stock-based compensation expense for the PSOs that are expected to vest. Stock-based compensation for PSOs 
is recognized over the service period, beginning in the period the Company determines it is probable that a milestone will be achieved. Forfeitures of PSOs 
are recognized as they occur. The Company reassesses the probability of the performance condition at each reporting period and adjusts the compensation 
cost based on the probability assessment. As of December 31, 2024, certain operational milestones were deemed probable of achievement. The aggregate 
intrinsic values of PSOs outstanding, vested and exercisable, and vested and expected to vest were calculated as the difference between the exercise price of 
the PSOs and the fair value of the Company’s common stock. The total estimated grant date fair value of PSOs vested during the years ended December 31, 
2024 and 2023, was $9.9 million and $3.4 million, respectively. No PSOs were granted or exercised during the years ended December 31, 2024 and 2023. The 
weighted-average estimated fair value of PSOs granted was $28.76 during the year ended December 31, 2022.
Restricted Stock Units
The following table summarizes activity under the Company’s Restricted Stock Units, or RSU, plans and related information:
 
 
RSUs Outstanding
 
 
Number 
of Shares
   
Weighted-Average Grant 
Date Fair Value
 
Unvested — December 31, 2023
 
3,444,112     $
55.21  
RSUs granted
 
3,169,688      
53.06  
RSUs vested
 
(1,043,199 )   
59.92  
RSUs cancelled
 
(400,654 )   
54.13  
Unvested — December 31, 2024
 
5,169,947      
53.22  
 
The fair value of the RSUs is determined on the grant date based on the fair value of the Company’s common stock. The fair value of the RSUs is 
recognized as expense ratably over the vesting period of one to four years. The total grant date fair value of the RSUs vested during the years ended 
December 31, 2024, 2023, and 2022 was $62.5 million, $54.6 million, and $47.1 million, respectively. The aggregate intrinsic value of the shares of the RSUs 
vested during the years ended December 31, 2024, 2023, and 2022 was $54.0 million, $33.0 million, and $37.8 million, respectively.
Performance Stock Units
The following table summarizes activity under the Company’s Performance Stock Units, or PSUs and related information: 
 
 
PSUs Outstanding
 
 
Number 
of Shares
   
Weighted-Average Grant 
Date Fair Value
 
Unvested — December 31, 2023
 
506,106     $
60.82  
PSUs granted
 
274,484      
62.60  
PSUs vested
 
(47,464 )   
72.17  
PSUs cancelled
 
(114,944 )   
68.07  
Unvested — December 31, 2024
 
618,182      
59.39  
 
The fair value of the PSUs is determined on the grant date based on the fair value of the Company’s common stock, except for certain PSUs with a 
market vesting condition, for which fair value is estimated using a Monte Carlo simulation model. PSUs are subject to vest only if certain specified criteria are 
achieved and the employees’ continued service with the Company. For certain PSUs, the number of PSUs that may vest are also subject to the achievement 
of certain specified criteria, including both performance conditions and market conditions. As of December 31, 2024, certain specified criteria were deemed 
probable of achievement or already achieved. Stock-based compensation for PSUs is recognized over the service period beginning in the period the Company 
determines it is probable that the performance criteria will be achieved. The total grant date fair value of the PSUs vested during the years ended December 
31, 2024, 2023, and 2022 was $3.4 million, $3.9 million, and $1.6 million, respectively, with an aggregate intrinsic value of the shares of $2.1 million, $1.3 
million and $2.0 million, respectively.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-32
Stock-Based Compensation Expense
Total stock-based compensation expense recognized was as follows (in thousands):
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Cost of sales
  $
1,469     $
1,166     $
902  
Research and development
   
86,616      
74,531      
74,464  
Selling, general and administrative
   
69,971      
59,516      
55,002  
Total stock-based compensation expense
  $
158,056     $
135,213     $
130,368  
Stock-based compensation of $2.6 million, $1.9 million, and $2.2 million was capitalized into inventory for the years ended December 31, 2024, 2023, 
and 2022, respectively. Capitalized stock-based compensation is recognized as cost of sales when the related product is sold. 
As of December 31, 2024, the total unrecognized compensation expense related to unvested equity awards, net of estimated forfeitures, was $256.8 
million, which the Company expects to recognize over an estimated weighted-average period of 2 years. In determining the estimated fair value of the stock 
options, PSOs and ESPP, the Company uses the Black-Scholes option-pricing model and assumptions discussed below. Each of these inputs is subjective and 
generally requires significant judgment to determine. 
Expected Term—The Company’s expected term represents the period that the Company’s stock-based awards are expected to be outstanding and is 
determined using the simplified method (based on the mid-point between the vesting date and the end of the contractual term). 
Expected Volatility—The Company’s expected volatility is based on historical volatility over the look-back period corresponding to the expected term. 
Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury zero coupon issues in effect at the time of grant for periods 
corresponding with the expected term of option. 
Expected Dividend—The Company has never paid dividends on its common stock and has no plans to pay dividends on its common stock. Therefore, 
the Company used an expected dividend yield of zero. 
Strike price for options awards and PSOs is equal to the closing market value of our common stock on the date of grant. 
The fair value of stock option awards granted was estimated at the date of grant using a Black-Scholes option-pricing model with the following 
weighted-average assumptions:
 
 
 
Year Ended December 31,
 
 
2024
 
2023
 
2022
Expected term (years)
 
6
 
6
 
6
Expected volatility
 
55%
 
55%
 
56%
Risk-free interest rate
 
4.2%
 
4.2%
 
2.0%
Expected dividend rate
 
0.0%
 
0.0%
 
0.0%
The fair value of PSOs granted was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average 
assumptions:
 
 
Year Ended 
December 31,
 
 
2022
Expected term in years
 
4
Expected volatility
 
57%
Risk-free interest rate
 
1.5%
Expected dividend rate
 
0.0%
 
14.
Defined Contribution Plan
The Company sponsors a retirement plan in which substantially all of its full-time employees in the U.S. and certain other foreign countries are eligible 
to participate. Eligible participants may contribute a percentage of their annual compensation to this plan, subject to statutory limitations. The Company 
recorded $9.8 million, $9.7 million, and $9.0 million as expense related to the plan for the years ended December 31, 2024, 2023, and 2022, respectively. 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-33
15.
Income Taxes
The components of the Company’s loss (income) before income taxes were as follows (in thousands):
 
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Domestic
  $
564,072     $
608,166     $
703,411  
Foreign
   
3,514      
298      
(1,686 )
Total loss before income taxes
  $
567,586     $
608,464     $
701,725  
 
The components of the Company’s income tax provision were as follows (in thousands):
 
 
Year Ended December 31,
   
 
 
2024
   
2023
   
2022
   
Current provision for income taxes:
 
 
   
 
   
 
   
Federal
  $
—     $
—     $
—    
State
   
224      
(3,187 )   
6,062    
International
   
2,745      
3,127      
1,274    
Total current tax provision
   
2,969      
(60 )   
7,336    
Deferred tax provision:
 
 
   
 
   
 
   
Federal
   
—      
—      
—    
State
   
—      
(1,608 )   
(1,640 ) 
International
   
(1,372 )   
(157 )   
—    
Total deferred tax provision
   
(1,372 )   
(1,765 )   
(1,640 ) 
Total provision for (benefit from) income taxes
  $
1,597     $
(1,825 )  $
5,696    
The Company has incurred net operating losses since inception. The Company has not reflected any benefit of such net operating loss carryforwards 
in the accompanying financial statements. The Company has established a full valuation allowance against its deferred tax assets due to the uncertainty 
surrounding the realization of such assets.
Beginning in 2022, the Tax Cuts and Jobs Act of 2017 eliminated the right to deduct research and development expenditures for tax purposes in the 
period the expenses were incurred and instead requires all U.S. and foreign research and development expenditures to be amortized over five and 15 tax 
years, respectively. Due to this required capitalization of research and development expenditures and the significant taxable income generated as a result of 
our sale of royalties in July 2022, the Company has recorded current state income tax expense of $6.1 million for the year ended December 31, 2022. For the 
year ended December 31, 2023, the Company recognized an income tax benefit of $4.8 million attributable to modifications in its state apportionment 
methodology, and then offset by an income tax expense of $3.0 million from foreign jurisdictions. For the year ended December 31, 2024, the Company 
recognized an income tax expense of $0.2 million for state tax, and income tax expense of $1.4 million from foreign jurisdictions. 
The effective tax rate of our provision for income taxes differs from the federal statutory rate as follows: 
 
 
 
Year Ended December 31,
   
 
 
2024
   
2023
   
2022
   
Federal statutory income tax rate
   
21.0   %  
21.0   %  
21.0   %
State income taxes, net of federal benefit
   
—    
 
0.8    
 
(0.4 ) 
Federal tax credits
   
10.8    
 
7.3    
 
5.9    
Other
   
0.1    
 
(0.7 ) 
 
(0.1 ) 
Nondeductible permanent items
   
(1.1 )  
 
(0.3 ) 
 
(0.6 ) 
Stock-based compensation
   
(1.6 )  
 
(1.8 ) 
 
(1.2 ) 
Uncertain tax positions
   
(2.0 )  
 
(1.4 ) 
 
(1.2 ) 
Change in valuation allowance
   
(27.1 )  
 
(24.1 ) 
 
(24.0 ) 
Foreign rate differential
   
(0.4 )  
 
(0.5 ) 
 
(0.2 ) 
Provision for income taxes
   
(0.3 ) %  
0.3   %  
(0.8 )%
 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-34
 
The tax effect of temporary differences that give rise to significant portions of the deferred tax assets is presented below (in thousands):
 
 
 
Year Ended December 31,
   
 
 
2024
   
2023
   
Deferred tax assets:
 
    
     
Loss carryforwards
  $
309,301     $
266,253    
Tax credits
   
369,988      
305,198    
Stock options
   
51,939      
44,795    
Accruals and reserves
   
32,140      
27,694    
Fixed assets and intangibles
   
32,391      
33,853    
Liabilities for sales of future royalties
   
196,664      
205,400    
Basis difference in equity investments
   
8,683      
8,423    
Capitalized research and development costs
   
211,969      
149,898    
Other
   
589      
281    
Gross deferred tax assets
   
1,213,664      
1,041,795    
Valuation allowance
   
(1,206,514 )   
(1,035,836 ) 
Total deferred tax assets
   
7,150      
5,959    
Deferred tax liabilities:
 
    
     
In-process research and development
   
(30,058 )   
(30,688 )  
Right-of-use lease assets
   
(5,778 )   
(5,329 )  
Gross deferred tax liabilities
   
(35,836 )   
(36,017 )  
Net deferred tax liabilities
  $
(28,686 )  $
(30,058 ) 
As of December 31, 2024 and 2023, the Company had approximately $1,190.5 million and $1,004.8 million, respectively, of federal net operating loss 
carryforwards available to reduce future taxable income that will begin to expire in 2031. As of December 31, 2024 and 2023, the Company had 
approximately $744.4 million and $659.9 million, respectively, of state net operating loss carryforwards available to reduce future taxable income that will 
begin to expire in 2031.
As of December 31, 2024 and 2023, the Company had federal research tax credit carryforwards of approximately $45.1 million and $46.9 million, 
respectively, available to reduce future tax liabilities that will begin to expire in 2031. As of December 31, 2024 and 2023, the Company had state research 
credit carryforwards of $92.0 million and $74.4 million, respectively, available to reduce future tax liabilities that will be carried forward indefinitely. 
As of December 31, 2024 and 2023, the Company had federal Orphan Drug Credits of $338.5 million and $269.6 million, respectively, available to 
reduce future tax liabilities that will begin to expire in 2031. 
The Company’s ability to use net operating loss and tax credit carryforwards to reduce future taxable income and liabilities may be subject to annual 
limitations pursuant to Internal Revenue Code Sections 382 and 383 as a result of ownership changes in the past and future. As a result of ownership changes 
in 2012 and 2011, $3.6 million of federal net operating loss carryforwards, $3.6 million of state net operating loss carryforwards, and $0.2 million of federal 
tax credits are permanently limited. Deferred tax assets for net operating losses and tax credits have been reduced and a corresponding adjustment to the 
valuation allowance has been recorded.
The valuation allowance increased by $170.7 million and $141.3 million during the years ended December 31, 2024 and 2023, respectively.
The Company recorded unrecognized tax benefits for uncertainties in income taxes. A reconciliation of the Company’s unrecognized tax benefits 
follows (in thousands):
 
 
 
December 31,
 
 
 
2024
   
2023
   
2022
 
Balance at beginning of year
  $
79,998     $
66,794     $
55,360  
Additions based on tax positions related to current
   year
   
14,825      
12,562      
11,316  
Additions for tax positions of prior years
   
2,173      
642      
377  
Reductions for tax positions of prior years
   
—      
—      
(259 )
Balance at end of year
  $
96,996     $
79,998     $
66,794  
 

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-35
Approximately $1.3 million in unrecognized tax benefits would impact the Company’s effective tax rate if recognized. The Company has elected to 
include interest and penalties as a component of tax expense. For the years ended December 31, 2024 and 2023, the Company recognized accrued interest 
and penalties of $0.1 million and $0.2 million, respectively, as a component of income tax expense. No accrued interest and penalties were recognized as a 
component of income tax expense during the year ended December 31, 2022. The Company does not anticipate that the amount of existing unrecognized 
tax benefits will significantly increase or decrease during the next year.
It is the Company’s intention to reinvest the earnings of its non-U.S. subsidiaries in their operations. As of December 31, 2024, the Company had not 
made a provision for any incremental foreign withholding taxes on approximately $13.0 million of the excess of the amount of net income for financial 
reporting over the tax basis of investments in foreign subsidiaries that are essentially permanent in duration. If these earnings were repatriated to the U.S., 
the deferred tax liability associated with these temporary differences would result in a nominal amount of withholding taxes.
The Company files income tax returns in the U.S. federal, 40 state tax jurisdictions, and ten foreign countries. The federal and state income tax returns 
from inception to December 31, 2024 remain subject to examination.
16.
Commitments and Contingencies
The Company has various manufacturing, construction, clinical, research, and other contracts with vendors in the conduct of the normal course of its 
business. Other than as noted below, contracts are terminable, with varying provisions regarding termination. If a contract with a specific vendor were to be 
terminated, the Company would only be obligated for the products or services that the Company had received at the time the termination became effective. 
Manufacturing and service contract obligations primarily relate to the manufacture of inventory for our approved products, the majority of which are 
due in the next 12 months. 
As of December 31, 2024, the aggregate payments under contractually-binding manufacturing and service agreements are as follows (in thousands):
 
 
 
Year Ended December 31,
 
 
 
2025
   
2026
   
Total
 
Manufacturing and Services
 
$
33,842     $
9,145     $
42,987  
 
The terms of certain of the Company’s licenses, royalties, development and collaboration agreements, as well as other research and development 
activities, require the Company to pay potential future milestone payments based on product development success. The amount and timing of such 
obligations are unknown or uncertain. These potential obligations are further described in “Note 9. License and Research Agreements.” 
See “Note 10. Leases” for lease commitments.
Contingencies 
In the ordinary course of business, the Company may become party to various claims and complaints. See “Item 3. Legal Proceedings” for material 
legal proceedings the Company is aware of. The process of resolving matters through litigation or other means is inherently uncertain, however management 
does not believe that any ultimate liability resulting from any of these potential claims will have a material adverse effect on its results of operations, 
financial position, or liquidity.
Guarantees and Indemnifications 
The Company indemnifies each of its directors and officers for certain events or occurrences, subject to certain limits, while the director or officer is or 
was serving at the Company’s request in such capacity, as permitted under Delaware law and in accordance with its certificate of incorporation and bylaws. 
The term of the indemnification period lasts as long as a director or officer may be subject to any proceeding arising out of acts or omissions of such director 
and officer in such capacity. The maximum amount of potential future indemnification is unlimited; however, the Company currently holds director liability 
insurance. This insurance allows the transfer of risk associated with the Company’s exposure and may enable it to recover a portion of any future amounts 
paid. The Company believes that the fair value of these indemnification obligations is minimal. Accordingly, it has not recognized any liabilities relating to 
these obligations for any period presented.

ULTRAGENYX PHARMACEUTICAL INC. 
Notes to Consolidated Financial Statements (continued)
 
F-36
17.
Related Party Transaction
In July 2022, the Company entered into an agreement with a non-profit foundation in which two members of the Company’s board of directors, 
including the Company’s Chief Executive Officer, at the time also served as board members of the foundation, whereby an aggregate $1.0 million 
contribution is being paid to the foundation over a four-year period, beginning in the third quarter of 2022, to support rare disease education and awareness. 
As a result, the Company recorded $0.3 million, $0.3 million, and $0.3 million as research and development expense for this agreement for the years ended 
December 31, 2024, 2023, and 2022, respectively.
18.
Net Loss per Share
The following table sets forth the computation of the basic and diluted net loss per share during the years ended December 31, 2024, 2023, and 2022 
(in thousands, except share and per share data): 
 
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Numerator:
 
    
    
   
Net loss
  $
(569,183 )  $
(606,639 )  $
(707,421 )
Denominator:
 
    
    
   
Weighted-average shares used to compute net loss per
   share, basic and diluted
   
90,538,118      
73,543,862      
69,914,225  
Net loss per share, basic and diluted
  $
(6.29 )  $
(8.25 )  $
(10.12 )
  
The following weighted-average outstanding common stock equivalents were excluded from the computation of diluted net loss per share for the 
periods presented because including them would have been antidilutive:
 
 
 
Year Ended December 31,
 
 
 
2024
   
2023
   
2022
 
Options to purchase common stock, 
    restricted stock units, and performance stock units
   
16,284,470      
14,152,286      
11,290,935  
Employee stock purchase plan
   
7,790      
8,450      
7,581  
 
   
16,292,260      
14,160,736      
11,298,516  
 
19.
Accumulated Other Comprehensive (Loss) Income 
Total accumulated other comprehensive (loss) income consisted of the following (in thousands):
 
 
Year Ended December 31,
 
 
 
2024
   
2023
 
Cumulative foreign currency translation adjustment
 
$
(1,650 ) 
$
(606 )
Unrealized gain (loss) on securities available-for-sale
 
 
1,007    
 
1,253  
    Total accumulated other comprehensive (loss) income
 
$
(643 ) 
$
647  
 
 

 
Exhibit 10.15
 
[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) 
THE TYPE THAT THE REGISTRANT TREATS A PRIVATE OR CONFIDENTIAL.
 
 
 
 
 
 
 
November 18, 2020
 
 
 
 
 
 
 
KYOWA KIRIN INC.	
(1)
 
AND
 
ULTRAGENYX PHARMACEUTICAL INC.	 (2)
 
 
 
 
 
 
SUPPLY AGREEMENT
 

 
 
CONTENTS
 
Clause	 Heading	Page
1
DEFINITIONS	3
2
DURATION	 10
3
APPOINTMENT	
10
4
EXCLUSIVITY	10
5
APPROVALS, AUTHORISATIONS, PRICING AND REIMBURSEMENT	
11
6
SUPPLY OF PRODUCTS	
11
7
DELIVERY AND ACCEPTANCE OF PRODUCT	 14
8
RISK AND TITLE	
16
9
PRODUCT SAFETY, RETURN AND RECALL	
16
10
PRICE AND PAYMENT	17
11
KYOWA KIRIN'S UNDERTAKINGS	
18
12
UGNX OBLIGATIONS	 18
13
COMPLIANCE WITH LAWS AND REGULATIONS	
19
14
RECORD KEEPING AND COOPERATION WITH INSPECTION	 19
15
REPORTING PROCEDURE	 20
16
DATA PROTECTION	
20
17
ANTI BRIBERY	
21
18
FORCE MAJEURE	 22
19
LIABILITY	
22
20
INDEMNITY	 23
21
INSURANCE	 24
22
TERMINATION	
24
23
CONSEQUENCES OF TERMINATION	25

 
 
-i-
24
CONFIDENTIALITY	
25
25
PARTIES	26
26
CONSTRUCTION AND INTERPRETATION OF THIS AGREEMENT	 26
27
CONTRACT ADMINISTRATION	 28
28
DISPUTE RESOLUTION PROCEDURE	29
29
LAW AND JURISDICTION	
30
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
-ii-

 
 
THIS AGREEMENT is made on October 27, 2020
 
BETWEEN
(1)
Kyowa Kirin, Inc., a corporation organized and existing under the laws of Delaware, having its principal office at 135 Route 
202/206, Suite 6 Bedminster, New Jersey 07921,
USA ("Kyowa Kirin"); and
(2)
ULTRAGENYX PHARMACEUTICAL INC. a company organised and existing under the laws of Delaware, USA with an address 
at 60 Leveroni Ct, Novato, CA, 94949, USA and its affiliates (collectively referred to herein as “UGNX”)
BACKGROUND
 
(A)
Kyowa Kirin’s parent company Kyowa Kirin Co., Ltd. (formerly Kyowa Hakko Kirin Co., Ltd. (KHK)) and UGNX entered into a 
Collaboration and License Agreement relating to the Product (as defined below) dated 29 August 2013, as amended, (the 
“Collaboration Agreement”) under which KHK and UGNX have been collaborating on the development and 
commercialisation of the Product.
(B)
KHK has licensed the right to develop, register and commercialise the Product in the Territory (as defined below) to UGNX.
(C)
Kyowa Kirin has initiated commercial supply of Product including in the United States and the European Union (EU).
(D)
UGNX wishes to make use of the Kyowa Kirin commercial supply capabilities for UGNX supply of Commercial Product in the 
Territory and Kyowa Kirin has agreed to this on the terms and conditions of this Agreement and in consideration of them.
(E)
Kyowa Kirin and UGNX entered into an Early Access Supply Agreement dated 12 March 2018 (as amended and restated 15 
November 2018) (the “EAP Agreement”) for Early Access Programme supply of the Product in the Territory.
THE PARTIES THEREFORE AGREE AS FOLLOWS:
1
DEFINITIONS
1.1
In this Agreement, the following words and expressions have the following meanings:
 
Affiliate
a person or entity that directly or indirectly Controls, is Controlled by, or is under common 
Control with the person or entity specified;
Agreed Supply Price
(a) thirty-five percent (35%) of Net Sales for Product sold in the Territory prior to January 
1, 2023 and (b) thirty percent (30%) of Net Sales for Product sold in the Territory 
thereafter;
Anti-Bribery Law
all Applicable Laws addressing public corruption or commercial bribery whether in the 
Territory or otherwise;
 

 
 
 
Applicable Laws
all national, supranational, foreign or local laws (including case law), legislation, statutes, 
statutory instruments, rules, regulations,
edicts, by-laws or directions or guidance from government or
 
 
 
 
 
Associated Person
 
Batch Documentation
governmental agencies including any rules, regulations, guidelines or other requirements 
of relevant regulatory authorities which have the force of law;
 
has the meaning set out in Clause 17.2(a);
 
The complete set of information, data and results applicable to one batch relating to the 
Manufacturing, control and release of the
particular batch, including but not limited to the applicable
 
 
 
 
 
 
 
Bribery Offence
executed drug substance and drug product Batch records, laboratory control results and 
in-process control results, any applicable Deviation and investigation reports and the 
Certificate of Analysis, Certificate of Compliance, Change requests, which are required to 
comply with all applicable cGMP requirements;
 
has the meaning set out in Clause 17.1(a);
Business Day
any day which is not a Saturday, a Sunday or a bank or public holiday in the United States 
of America;
Chairman
 
Collaboration Agreement
has the meaning set out in Clause 28.4; has the meaning set out in 
Background (A).
Commencement Date
November 02, 2020;
Commercially Reasonable 
Efforts
with respect to the development, manufacture or commercialisation of the Product, 
conducting such tasks using such efforts and resources that are typically used by a 
pharmaceutical company in conducting the same tasks on its own orphan or rare disease 
compounds or products with similar commercial and scientific potential at a similar stage 
in their lifecycle and in a similar therapeutic area, taking into consideration [***] and all 
other factors that are typically taken into consideration by pharmaceutical companies 
when determining
 

 
 
 
 
the level of efforts and resources to apply to such tasks with respect to its own orphan or 
rare disease similar compounds or products (as described above). Commercially 
Reasonable Efforts shall be determined with respect to [***];
Confidential Information
the provisions of this Agreement and all information which is secret or otherwise not 
publicly available (in both cases either in its entirety or in part) including commercial, 
financial, marketing or technical information, know-how, trade secrets or business 
methods, or Data, in all cases whether disclosed orally or in writing before or after the 
date of this Agreement;
Control
that a person (i) possesses, directly or indirectly, the power to direct or cause the 
direction of the management and policies of the other Person (whether through the 
ownership of voting shares or power, ability to appoint directors, by contract or 
otherwise) or
(ii) owns directly or indirectly, fifty percent (50%) or more of the voting securities or 
other ownership interest of the other Person. For purposes of this definition, “Person” 
means an individual, a corporation or a partnership. "Controls" and "Controlled" shall be 
interpreted accordingly;
Dispute
has the meaning set out in Clause 28.1;
Early Access Programme or 
EAP
a mechanism that enables patients with an unmet medical need to be provided with 
access to a medicine, prior to it being made
 
commercially available in that country. Dependent upon national regulation, Early Access 
Programmes may encompass Early Access  to  Medicines  Schemes  (EAMS),  
Authorisation  for
Temporary Utilisation (ATU), Compassionate Use Programmes
 
 
 
Fixed Forecast Period
(CUP) and Named Patient Programmes (NPP). has the meaning set out in 
Clause 6.7;
For-Cause Audit
an audit of manufacturing records of Kyowa Kirin or its subcontractors,	and/or	 an	
inspection	
of	 Kyowa	 Kirin’s
 
manufacturing facilities, following: (a) an unfavorable critical
observation during an inspection of a Public Authority that is potentially material to the 
quality of the Product or (b) a major or repeated quality excursion that may result in a failed 
Product batch or Product recall.

 
 
 
Force Majeure
any event outside the reasonable control of either party affecting its ability to perform 
any of its obligations (other than payment) under this Agreement including act of God,
fire, flood, lightning, war, revolution, act of terrorism, riot, epidemic/pandemic, or civil 
commotion;
Good Distribution Practice
a set of criteria to be satisfied for the proper distribution of medicinal products for 
human use. It regulates the division and movement of products from the premises of the 
manufacturer or another central point, to the end user thereof, or to an intermediate 
point by means of various transport methods and also includes requirements for the 
purchase, receiving, storage, and export of drugs;
Good Manufacturing 
Practices
the good manufacturing practices required by the United States Food and Drug 
Administration and as set forth in the laws and regulations in the United States with 
respect thereto, for the manufacture and testing of pharmaceutical materials, and 
comparable Applicable Laws and requirements of Regulatory Authorities applicable to 
the manufacture and testing of pharmaceutical materials in jurisdictions within the 
Territory, as they may be updated from time to time, including applicable rules and 
guidelines promulgated under the International Conference on Harmonization;
Government Official
any officer, employee, agent or representative of any Public Authority (including any 
medical care provider controlled or funded in whole or in part by any Public Authority) or 
any political party, political party official or candidate for political office;
Healthcare Provider
an individual physician or other medical professional, a healthcare institution, or an 
administrator or any other person affiliated with a healthcare institution who may have 
influence on the decision to purchase, prescribe or use a Product;
Health Registration Approval any and all approvals, licences, registrations or authorisations necessary to import, store, 
commercially distribute, sell and market the Product in the Territory, including, where 
applicable,
(a) the MA, (b) pricing or reimbursement approval, and (c) labelling approval;
ICC
has the meaning set out in Clause 28.3;
Insolvency Event
where a party:
 

 
 
 
 
(a)
files for protection under bankruptcy or insolvency laws;
(b)
makes an assignment for the benefit of creditors;
(c)
appoints or suffers appointment of a receiver or an administrative receiver of, 
or an encumbrancer taking possession of or selling, the whole of or any part 
of the entity’s undertaking, assets, rights or revenue;
(d)
proposes a written agreement of composition or extension of its debts;
(e)
proposes or is a party to any dissolution or liquidation;
(f)
files a petition under any bankruptcy or insolvency act or has any such 
petition filed against that is not discharged within sixty (60) days of the filing 
thereof;
(g)
admits in writing its inability generally to meet its obligations as they fall due 
in the general course; or
(h)
suffers an event or is the subject of a proceeding in any jurisdiction to which it 
is subject that has an effect equivalent or similar to any of the events listed in 
points (a) to (g) above;
Intellectual Property 
Rights
any patent, copyright, trade mark, service mark or trade name, utility model, right in 
software, right in design, right in databases, image right, moral right, right in an invention, 
right relating to passing off, domain name, right in confidential information (including 
trade secrets) or right of privacy, and all similar or equivalent rights in each case whether 
registered or not and including all applications (or rights to apply) for, or renewal or 
extension of, such rights which exist now or which will exist in the future in the Territory 
and all other countries in the world;
Inventory Acceptance 
Requirements
the following standard inventory acceptance requirements:
 
(a)
minimum shelf life as set out in Clause 6.4;
(b)
compliance with the Quality Agreement;
(c)
compliance	 with	
the	 Product	 specifications contained in the relevant 
MA; and
(d)
compliance with Good Manufacturing Practices;
 

 
 
 
KHK
Kyowa Kirin Co., Ltd. (formerly Kyowa Hakko Kirin Co., Ltd);
Losses
has the meaning set out in Clause 20.1;
MA
a Marketing Authorization to sell a pharmaceutical product in any country in the Territory;
 
Minimum Order Quantity
 
has the meaning set out in Clause 6.16;
Minimum Supply Price
[***] US Dollars ($[***) per vial of Product.
Net Sales
has the meaning set out in Schedule 1 (Price and Payment);
Out of Condition
Kyowa Kirin Product that is not in compliance with Applicable Laws, Good Distribution 
Practices, Good Manufacturing Practices or instructions from Kyowa Kirin;
Personnel
the employees of or persons otherwise engaged by UGNX for the purpose of fulfilling this 
Agreement;
Product
KHK’s recombinant human IgG1 monoclonal antibody product targeting FGF23 identified 
as KRN23 (burosumab solution for injection bulk naked vials in 10mg, 20mg and 30mg 
presentations);
Profit Share Territory
has the meaning ascribed to it in the Collaboration Agreement;
Public Authority
any national, subnational or local government or any subdivision, authority or agency 
thereof;
Purchase Order Lead Time
has the meaning set out in Clause 6.14;
Quarter
one of the three month periods ending upon 31st March, 30th June, 30th September and 
31st December in each Year during the term of this Agreement, [***] until the date on 
which this Agreement expires or is terminated;
 

 
 
 
 
 
[***] Report
has the meaning set out in Schedule 1 (Price and Payment);
Rules
has the meaning set out in Clause 28.3;
Quality Agreement
the agreement to be entered into between Kyowa Kirin and UGNX, defining the roles and 
responsibilities for each party in relation to the quality and manufacture of the Product in 
the Territory;
Term
the term of this Agreement as set out in Clause 2.1;
Termination
the termination or expiration of all or part of this Agreement;
Termination Date
the date on which Termination takes effect;
Territory
On a country-by-country basis, upon Health Registration Approval following which such 
country ceases to be part of the territory under the EAP Agreement, Argentina, Brazil, 
Chile, Colombia, Mexico, Peru, Ecuador, Costa Rica, Guatemala, El Salvador, Honduras,
Belize and Panama;
The Kyowa Kirin Indemnified 
Party
has the meaning set out in Clause 20.1;
The UGNX
Indemnified Party
has the meaning set out in Clause 20.2;
Tribunal
has the meaning set out in Clause 28.4;
Withholding Tax
has the meaning set out in Clause 10.6;
Year
a period of twelve (12) months commencing on the Commencement Date and on each 
successive anniversary of the Commencement Date and ending on the day before each
successive anniversary of the Commencement Date;
 

 
 
1.2
Drafting Conventions
(a)
The headings in this Agreement are inserted for convenience only and shall not affect the interpretation or 
construction of this Agreement.
(b)
Words expressed in the singular shall include the plural and vice versa. Words referring to a particular gender 
include every gender. References to a person include an individual, company, body corporate, corporation, 
unincorporated association, firm, partnership or other legal entity.
(c)
The words "other", "including" and "in particular" shall not limit the generality of any preceding words or be 
construed as being limited to the same class as any preceding words where a wider construction is possible.
(d)
References to any statute or statutory provision shall include (i) any subordinate legislation made under it, (ii) 
any provision which it has modified or re-enacted (whether with or without modification), and (iii) any 
provision which subsequently supersedes it or re-enacts it (whether with or without modification) whether 
made before or after the date of this Agreement.
(e)
All references in this Agreement to Clauses, and Schedules are to the clauses, and schedules to this 
Agreement unless otherwise stated.
2
DURATION
2.1
This Agreement shall come into force on the Commencement Date and shall, subject to the provisions for earlier 
termination set out in this Agreement, continue in force throughout the term of the Collaboration Agreement, and 
thereafter this Agreement shall be automatically extended for consecutive [***] periods unless either party gives [***] 
written notice of termination to terminate at the date of expiration of the Collaboration Agreement or at the end of 
any subsequent renewal period (the "Term"), or unless both parties mutually agree to a termination date in writing.
3
APPOINTMENT
3.1
UGNX hereby appoints Kyowa Kirin and Kyowa Kirin hereby accepts the appointment as UGNX’s exclusive supplier of 
the Product for commercialisation in the Territory subject to and in accordance with the provisions of this Agreement.
4
EXCLUSIVITY
4.1
Throughout the Term of this Agreement:
(a)
Kyowa Kirin shall exclusively supply UGNX with the Product in the Territory. This means that Kyowa Kirin shall 
not be entitled to appoint other distributors in the Territory, actively sell or distribute, nor permit the 
distribution of the Product directly to customers in the Territory; and
(b)
UGNX shall exclusively purchase its supplies of the Product in the Territory from Kyowa Kirin. This means 
UGNX shall not purchase supplies of the Product from any other party for resale to customers in the Territory.
5
APPROVALS, AUTHORISATIONS, PRICING AND REIMBURSEMENT
5.1
Following grant of an MA for the Product in each country in the Territory, UGNX (or its designee) shall maintain the 
MA, including carrying out, in a timely manner, [***] expense, any necessary regulatory variation required following 
notification by Kyowa Kirin of any change to the Product specification, which change Kyowa Kirin shall notify to UGNX 
as soon 

 
 
as reasonably practicable. Kyowa Kirin shall provide to UGNX all necessary documentation, expertise and know-how 
for the maintenance of the MAs, including without limitation, any necessary regulatory variation, as further set forth in 
the Quality Agreement and/or as reasonably requested by UGNX.
5.2
During the Term of this Agreement UGNX shall be solely responsible for any necessary negotiation of pricing and 
reimbursement for the Product in the Territory.
5.3
During the Term of this Agreement UGNX shall have sole responsibility for seeking, obtaining and maintaining all 
licenses, registrations, permits and Health Registration Approvals, and for market access, distribution, medical affairs, 
and pharmacovigilance for the Product (subject to the pharmacovigilance agreement between the parties in respect of 
the Product in the Territory).
5.4
In the event of changes to facilities, equipment, processes, specifications, quality control and sourcing of material, 
sampling and test methods and quality assurance release process, both parties shall use their [***] to minimize 
obsolescence and interruption of supply. The change-initiating party shall notify the other party as soon as practicable 
of the planned change. UGNX is responsible to approve and determine the regulatory impact of such change in the 
Territory. Kyowa Kirin shall provide to UGNX an inventory reconciliation of such materials with [***] of notification by 
either party of the planned change. The parties shall mutually agree upon an implementation schedule for the planned 
change and means to minimize obsolescence and interruption of supply. The party initiating the changes shall be 
responsible [***] associated with the resulting obsolescence.
6
SUPPLY OF PRODUCTS

 
 
Product Overview
6.1
During the Term of this Agreement, Kyowa Kirin shall supply Product as naked, unlabelled product. Product will be 
supplied to UGNX from the bulk drug Product supply maintained at Kyowa Kirin’s packaging facility or its approved 
third party packaging facility as outlined in section 7.2. Kyowa Kirin agrees to maintain in inventory of sufficient 
Product, as mutually agreed through the joint sales and operations planning process.
6.2
Kyowa Kirin will manufacture and test the drug substance and drug product at manufacturing sites as approved in the 
Territory’s Marketing Authorization. UGNX will have reasonable access to audit and oversee the drug substance and 
drug product manufacturing sites to support their compliance with UGNX MAs. Oversight rights and requirements will 
be subject to the Collaboration Agreement and the Quality Agreement.
6.3
Kyowa Kirin warrants that the Product supplied under this Agreement will, on the date of delivery and throughout the 
Product shelf-life, meet the Inventory Acceptance Requirements, Specification, and be manufactured in accordance 
with all Applicable Laws, provided that the Product has been stored and handled by Kyowa Kirin and

 
 
UGNX in accordance with Good Distribution Practice, relevant Product dossiers, and the Quality Agreement.
6.4
Product provided to UGNX shall have no less than [***] of remaining shelf life at the date of delivery to UGNX. Kyowa 
Kirin will [***] to maximize available shelf-life for UGNX upon delivery. Accommodation to accept material with [***], 
shall be worked on by both parties in good faith to optimize the total drug product inventory and reduce product 
expiry.
6.5
Subject to the terms of this Agreement and the requirements of Applicable Laws, Kyowa Kirin will retain all rights and 
responsibility to conduct at its cost all necessary development activities related to the manufacture and supply of the 
Product, including process development, manufacturing scale-up, development-stage and commercial- stage 
manufacturing, quality assurance/quality control procedure development, and compilation and reporting of CMC 
(Chemistry, Manufacturing Controls) information.
Rolling Forecasts
6.6
Upon Commencement Date or filing for product approval with the Health Authority in each country of the Territory, 
whichever occurs first, UGNX shall submit [***] forecasts. [***] during the Term of this Agreement, UGNX shall submit 
to Kyowa Kirin, within [***] after the [***] of each [***], written or electronic forecasts of the quantities on a rolling 
basis of the Product that it desires or expects to order from Kyowa Kirin during [***] period. Forecasts shall be [***] in 
the subsequent [***] period.
Firm Commitment and Estimates
6.7
The first [***] ("Fixed Forecast Period") covered by each forecast shall constitute a binding commitment by UGNX to 
purchase the quantities of Product covered by such forecast.
6.8
With respect to [***] of the forecast, quantities shall constitute a non-binding forecast of UGNX orders, presented 
solely for the purposes of [***].
6.9
Within [***] of start of Fixed Forecast Period, Kyowa Kirin shall confirm to UGNX the Product Batch information 
including lot number to allow UGNX to commence Batch Documentation review. Kyowa Kirin shall make available to 
UGNX all Batch Documentation necessary to support UGNX confirmation that the Product complies with the Inventory 
Acceptance Requirements. UGNX shall confirm to Kyowa Kirin suitability of the lot for the Territory or intended market 
within the Territory [***] of receipt of all Batch Documentation necessary to confirm conformance with Inventory 
Acceptance Criteria. In the event the lot is not deemed acceptable for the Territory, Kyowa Kirin shall [***].
6.10
After UGNX provides confirmation that the lot has met Inventory Acceptance Requirements, the Product shall remain 
[***] until delivery occurs in accordance with Clause 7.
6.11
UGNX shall from time to time submit a purchase order in a written form approved by Kyowa Kirin for the supply of 
Product in accordance with the forecast quantities in the Fixed Forecast Period described in Clause 6.7 above. UGNX 
shall place purchase orders [***]. The purchase order shall [***].
6.12
Printed or written purchase orders, order acknowledgements or invoices shall not modify or expand either party's 
obligations under this Agreement. In the event of any inconsistency between the terms of any purchase order, order 
acknowledgement or invoice, and the terms of this Agreement, the terms of this Agreement shall prevail.

 
 
Acceptance of Purchase Orders
6.13
Kyowa Kirin shall confirm receipt of a purchase order within [***] of receipt. Acceptance or rejection of a purchase 
order shall be made in writing, including by email, within [***] of receipt, with such acceptance of the order to include 
[***]; provided, however, in the event Kyowa Kirin does not [***], the applicable purchase order shall be deemed 
accepted. Kyowa Kirin may only reject a purchase order if that order:
(a)
[***];
(b)
[***];
(c)
[***];
(d)
[***]; or
(e)
[***]
6.14
The purchase order lead time for the supply of the Product to UGNX shall be [***] (the “Purchase Order Lead Time”).To the 
extent that any order provides for a due date that is less than the Purchase Order Lead Time, Kyowa Kirin shall be entitled to 
require that the due date be postponed in line with the Purchase Order Lead Time.
6.15
If Kyowa Kirin is unable to meet the requested due date or quantity of a purchase order, Kyowa Kirin shall notify UGNX 
within [***]. Kyowa Kirin will [***] to minimize the delay. To the extent the available supply of, or capacity to 
manufacture the Product is less than the requirements of UGNX and its Affiliates hereunder together with the 
requirements of Kyowa Kirin and its Affiliates and their licensees, Kyowa Kirin shall allocate the available Product [***]. 
In the event of any shortage in availability of supply of, or capacity to manufacture Product as contemplated by this 
Clause, the parties will [***]. Notwithstanding the foregoing, at the request of UGNX, if UGNX has met its obligations 
for Fixed Forecasts in Sections 6.7 –6.10 above, [***] as a result of

 
 
[***]. If UGNX has not met its obligations for Fixed Forecasts then [***]. Kyowa Kirin agrees to maintain in inventory
sufficient bulk drug substance for the Product, in line with the Product supply chain strategy as mutually agreed 
through the joint sales and operations planning process, based on UGNX’s most recent forecast for the Territory.
Minimum Order Quantity and Deviation from Minimum Order Quantity
6.16
UGNX shall place orders for the Product based on a minimum order quantity of [***] (“Minimum Order Quantity”). 
Orders for the Product of quantities exceeding the Minimum Order Quantity shall be placed by UGNX in increments of 
the Minimum Order Quantity.
In the event that UGNX desires to purchase a quantity of Product which is less than the Minimum Order Quantity, 
then [***]. The parties shall work to achieve an order quantity and delivery methodology that is appropriate for both 
parties.
Regular Business Reviews
6.17
The parties shall nominate representatives who meet, either in person or by telephone or by video conference, as 
applicable, on a regular, at least [***], basis as necessary [***] to review manufacturing, forecasting, logistical and 
quality assurance aspects to resolve any pending issues in relation to such aspects. These regular business reviews may 
be part of the standing sales and operations planning (S&OP) meeting or the regular business reviews may be separate 
meetings.
7
DELIVERY AND ACCEPTANCE OF PRODUCT
7.1
Any dates specified by Kyowa Kirin for delivery of the Product are intended to [***] to ensure that delivery shall be 
within the Purchase Order Lead Time. If no dates are so specified, Kyowa Kirin shall [***] to ensure that delivery will be 
within the Purchase Order Lead Time.
7.2
Product will be delivered to UGNX by Kyowa Kirin [***] to regional packaging facility located in [***] or other such 
packaging facility as approved in advance by UGNX. Product shall be made available to UGNX from Kyowa Kirin 
approved inventory from a regional packaging facility, having already been transported from the point of manufacture 
to a regional packaging facility using Kyowa Kirin qualified shipping lanes.
7.3
All Product supplied by Kyowa Kirin shall be examined and checked upon transfer or delivery to UGNX (or its designee 
at the regional packaging site) in order to ascertain that the Product complies with the lot release information, 
quantity, and Inventory Acceptance Requirements.
7.4
Unless Kyowa Kirin is notified in writing within [***] after the date of delivery, of (i) any non-compliance with the lot 
release information, quantity, or

 
 
Inventory Acceptance Requirements which can be reasonably detected through visual inspection of the Product or (ii) 
any alleged shortages in the quantity of delivered Product, [***]. In the event that UGNX determines [***] after the 
date of delivery, that the Product did not materially conform with the specifications on the date of delivery or 
otherwise comply with the product warranty in Clause 6.3 or the requirements of the purchase order (such as 
matching the quantities ordered), UGNX shall provide notice to Kyowa Kirin thereof, and, if requested by Kyowa Kirin, 
ship or provide a sample portion of the affected Product to Kyowa Kirin or its designated contract manufacturing 
organization (CMO), freight prepaid and properly insured, along with a reasonably detailed statement of the claimed 
non-conformity and copy of Kyowa Kirin’s invoice therefor. UGNX shall retain the balance of the Product that is 
subject to review subject to resolution of the rejection and further disposition in accordance with this Clause 7.
7.5
For quality defects which are not reasonably detectable through visual inspection, UGNX shall notify Kyowa Kirin 
thereof by written notice within [***] after becoming aware thereof. In case of non-compliance with the Inventory 
Acceptance Requirements and UGNX notifies Kyowa Kirin of such non-compliance in accordance with this Clause 7.5, 
Kyowa Kirin shall, at Kyowa Kirin’s option, either replace such Product [***] or refund [***] as soon as reasonably 
feasible.
7.6
In the event that Kyowa Kirin agrees that the returned Products were non-conforming (or such non-conformance is 
confirmed under Clause 7.7 below), Kyowa Kirin shall replace all of such non-conforming units of Product, [***], and 
Kyowa Kirin shall as soon as practicable deliver to UGNX, freight prepaid, all replacement units of the Product, [***].
UGNX shall return all non-conforming Product to Kyowa Kirin per instructions provided [***].
7.7
In the event that Kyowa Kirin disagrees with UGNX’s rejection because the Product is in fact conforming, the parties 
shall cooperate to have both UGNX’s returned samples and Kyowa Kirin’s retained samples from the same production 
batch of the Product in dispute analyzed by a mutually acceptable independent testing laboratory of recognized 
reputation in the pharmaceutical industry, using the analytical methods, tests and criteria for conformance set forth in 
the specifications. If Kyowa Kirin is unable to deliver the Product on time because UGNX has not provided appropriate 
instructions, documents, licences or authorisations, then the Product will be deemed to have been delivered, [***] and 
Kyowa Kirin may store the Product, in conditions which adequately protect and preserve the Product, until actual date 
of delivery, [***].
7.8
The up-front out-of-pocket external costs associated with the return in 7.7 shall be [***] by the parties, unless and 
until an alternative determination is made as provided below. The results of such laboratory testing shall be conclusive 
and binding on the parties on the issue of compliance of such units of Product with the specifications on the date of 
delivery. If such independent testing laboratory determines that UGNX’s returned samples of such Product conform to 
the specifications and other Product warranties hereunder, then (i) the applicable Product shall be deemed to have 
been improperly rejected by UGNX, and (ii) [***]. If such independent testing laboratory determines that UGNX’s 
returned samples of such Product did not

 
 
conform to the specifications and other Product warranties hereunder and that such returned samples conform to the 
samples for such batch retained by Kyowa Kirin, then [***], and Kyowa Kirin shall promptly supply to UGNX 
conforming Product in accordance with Clause 7.6.
7.9
UGNX will provide, [***], at the place of delivery or transfer, adequate and appropriate equipment and manual labor 
for acceptance and receipt of the Product.
7.10
In the event that the quantities of the Product delivered to UGNX (in one or more shipments) do not match the 
quantity ordered in any material respect, Kyowa Kirin shall promptly ship (such shipping at [***]) the additional 
Product required to make up such shortfall; or if the amount shipped exceeds the amount ordered by a material 
amount, UGNX shall accept only the amount ordered, in which case upon Kyowa Kirin’s request and at [***], such 
additional quantities shall be returned to Kyowa Kirin or stored by UGNX [***].
8
RISK AND TITLE
8.1
Title and risk of loss to Products shall pass to UGNX upon transfer or delivery to UGNX or its designee.
9
PRODUCT SAFETY, RETURN AND RECALL
9.1
Prior to the first supply of the Product, the parties shall agree and execute:
(a)
the Quality Agreement; and
(b)
a form of pharmacovigilance agreement.
9.2
Each party shall comply at all times with the written instructions and all written guidelines issued from time to time 
attached to the Product concerning their storage, application and use (including as set out in the Quality Agreement) 
and each party shall refer its Personnel and customers to such instructions, guidelines and the Quality Agreement.
9.3
Each party shall keep the other properly informed of all customer complaints concerning the Product and shall comply 
with any reasonable directions of the other party in any issues, proceedings or negotiations relating to such complaint, 
subject to compliance with Applicable Laws.
9.4
If any used Product is returned to UGNX for any reason other than Product quality claims, UGNX shall promptly notify
Kyowa Kirin and if requested shall ship such Product to Kyowa Kirin [***] of the return, unless Applicable Law prohibits 
such shipment. Kyowa Kirin shall [***].
9.5
If Kyowa Kirin notifies UGNX in writing of any defect in the Product previously delivered by Kyowa Kirin or any error or 
omission in the instructions for the use of the Product which exposes or may expose consumers to any risk of death, 
injury or damage to property, UGNX shall [***] under this section.
9.6
UGNX is responsible for determination of need for recall, withdrawal, or field corrections in the Territory. UGNX and 
Kyowa Kirin shall [***] notify each other of any recall or potential recall of the Product. Without prejudice to the terms 
of the Quality Agreement, Kyowa Kirin may, at its discretion [***], determine a need to recall Product sold or allocated 
to UGNX. Kyowa Kirin shall [***] for any such recalled Product and/or resupply conforming Product to UGNX [***].
10
PRICE AND PAYMENT
10.1
UGNX shall pay to Kyowa Kirin the applicable payments in relation to the supply of the Product in accordance with the 
provisions of Schedule 1.

 
 
10.2
All sums payable under this Agreement are [***] of VAT or any other applicable tax or duty that must be paid in 
addition at the rate and in the manner prevailing at the relevant tax point.
10.3
All amounts to be paid by the parties under this Agreement shall be in US Dollars and payment shall be in US Dollars by 
electronic transfer to the bank accounts as notified by the parties from time to time with any applicable charges on 
such payments being at the recipient’s expense.
10.4
Without prejudice to Clause 10.5, if any undisputed sum due from UGNX to Kyowa Kirin under the Agreement is not 
paid on or before the due date for payment and not cured within [***] following UGNX’s receipt of written notice 
thereof, then without prejudice to Kyowa Kirin's other rights under this Agreement, Kyowa Kirin shall be entitled to:
(a)
[***];
(b)
[***]; and
(c)
[***].
10.5
If any sum payable under this Agreement is not paid when due such non-payment is and not cured within [***] 
following the defaulting party’s receipt of written notice thereof then, without prejudice to the non-defaulting party's 
other rights under this Agreement, it shall be entitled to charge interest on the overdue amount from the due date 
until payment is made in full both before and after any judgment, [***].
10.6
A party receiving a payment pursuant to this Agreement shall [***] taxes levied on such payment. If a party making 
payment is required under Applicable Laws to pay any withholding tax, charge, or levy (“Withholding Tax”) in respect 
of any payments due under the Agreement, the remitting party shall:
(a)
[***] from the payment;
(b)
make [***] to the proper governmental authority for the account of the other party; and
(c)
provide the other party with [***].

 
 
To the extent that amounts [***].
10.7
The parties acknowledge and agree that (a) KHK is responsible for all third party royalties under the Collaboration 
Agreement and (b) UGNX shall have no obligation to pay royalties to any third party under this Agreement.
11
KYOWA KIRIN'S UNDERTAKINGS
11.1
Kyowa Kirin agrees that at all times during the Term of this Agreement it shall:
(a)
promptly inform UGNX of any changes in the specifications of the Product (which may not occur without 
UGNX’s prior approval, not to be unreasonably withheld) or of the discontinuation of production of any of the 
Product, whenever reasonably possible;
(b)
shall supply the Product to UGNX for sale in the Territory in accordance with UGNX's forecast requirements, 
this Agreement and the Quality Agreement; and
(c)
comply with all Applicable Laws.
12
UGNX OBLIGATIONS
12.1
UGNX shall during the Term of this Agreement:
(a)
use [***] to hold stocks of Product sufficient to meet reasonably anticipated demand for the Product from the 
customers in the Territory;
(b)
at [***] (except as otherwise expressly set forth in this Agreement) ensure that any registration, translation, 
labelling or warning or notification requirements concerning this Agreement or the Product are in accordance 
with all Applicable Laws and UGNX shall promptly provide full details of all actions taken in this respect to 
Kyowa Kirin;
(c)
employ sufficient and suitable Personnel to perform its obligations under this and the Quality Agreement and 
ensure that all such Personnel are appropriately trained to perform such obligations;
(d)
if Product in the possession of, under the control of or sold by UGNX is or becomes Out of Condition UGNX 
shall, if required by Kyowa Kirin, give all reasonable assistance to Kyowa Kirin in locating and recovering the 
Out of Condition Product and preventing its sale to third parties;
(e)
comply with all Applicable Laws and manage all contacts with regulatory authorities and Healthcare Providers 
in the Territory, including all registrations for the lawful sale of the Product;
(f)
be responsible for seeking, obtaining and maintaining all licenses, registrations, permits and Health 
Registration Approvals required to be obtained by UGNX to enable UGNX to act as distributor and importer of 
the Product in the Territory pursuant to this Agreement;
(g)
be responsible for all customs, duties and other governmental charges relating to the importation of the 
Product in the Territory;
(h)
be responsible for all quality control release testing, retention of samples, lot release, labelling and packaging 
of the Product for commercial distribution in the Territory, all in full compliance with the Applicable Laws; and
(i)
for a period of [***], or longer if required by Applicable Laws, store and make available to Kyowa Kirin the 
following information:

 
 
(i)
[***]; and
(ii)
[***].
13
COMPLIANCE WITH LAWS AND REGULATIONS
13.1
UGNX shall [***] to give Kyowa Kirin [***] of any prospective changes in any Applicable Laws in the Territory of which 
UGNX is aware and which, to the knowledge of UGNX may affect the manufacturing Kyowa Kirin’s manufacturing 
responsibility requirements of the Product as sold into the Territory.
13.2
On receipt of notification from UGNX under Clause 13.1, Kyowa Kirin shall [***] to ensure that the Product complies
with any change in the Applicable Laws by the date of implementation of that change or as soon as is reasonably 
possible afterwards.
14
RECORD KEEPING AND COOPERATION WITH INSPECTION
14.1
UGNX shall maintain complete and accurate records concerning:
(a)
all of its purchases and sales of the commercial product derived from the naked unlabelled vials of Product;
(b)
records related to its quality and regulatory obligations under this Agreement. UGNX shall maintain quality 
and regulatory records in an orderly fashion for a period of [***] counting from the date of each purchase or 
sale. UGNX shall, at Kyowa Kirin’s request made upon reasonable notice (such notice to be presumed 
reasonable if made at least [***] in advance [***]) during normal business hours, in such a way as not to 
disrupt normal business, and [***], provide Kyowa Kirin (or its designated representative) with [***] access to 
all records required by this Clause 14.1 at UGNX’s place of business or at such other location mutually agreed 
upon by the parties, and shall fully cooperate in allowing Kyowa Kirin (or its designated representative) to 
inspect such records as requested, under confidentiality obligations. To enable Kyowa Kirin to conduct such 
inspection in a non-invasive manner, UGNX shall [***].

 
 
UGNX shall notify Kyowa Kirin of filing for regulatory approval in a country in the Territory within [***] of 
submission of filing, such that Kyowa Kirin can prepare for any related inspection by a health authority or
other regulatory body.
14.2
Kyowa Kirin shall advise UGNX promptly, but in no event later than [***] after Kyowa Kirin’s receipt of notice thereof, 
of any planned regulatory authority visit to the portion of the facilities of Kyowa Kirin or its Affiliates or CMO where 
Product is manufactured, stored or handled or any material written inquiries by a regulatory authority concerning such 
facilities, the procedures of Kyowa Kirin or its Affiliates or CMO for the manufacture, storage or handling of Product. If 
the regulatory authority makes an unannounced or unplanned visit, or if Kyowa Kirin does not have at least [***’] 
notice of the visit, Kyowa Kirin shall inform UGNX of the visit within [***] after Kyowa Kirin obtains actual knowledge 
of the visit. Kyowa Kirin shall inform UGNX as soon as practicable regarding the purpose and result of such visit or 
inquiry, and shall provide to UGNX [***], to the regulatory authority or issued by or provided by the regulatory 
authority to Kyowa Kirin or its Affiliates or CMO, as the case may be, in connection with such visit or inquiry.
15
REPORTING PROCEDURE
15.1
UGNX shall promptly (or as otherwise set forth herein) notify Kyowa Kirin of:
(a)
on a [***] basis, all material enquiries concerning the Product or orders for the Product that it receives and 
respond as instructed by Kyowa Kirin;
(b)
any material non-compliance observations or complaints made by customers in respect of the Product , and, 
insofar as the compliant relates to the Product itself, shall not, [***]; and
(c)
any actual, threatened or suspected infringement by the Product of any Intellectual Property Rights belonging 
to any third party or any actual, threatened or suspected infringement by any third party of the Intellectual 
Property in the Product which comes to UGNX's notice from time to time and [***] to safeguard the property 
rights and interests of Kyowa Kirin and [***].
15.2
Both parties understand and agree to comply with all applicable domestic and foreign financial 
transparency/disclosure laws and other associated rules and regulations. Each party shall manage its own records and 
independently report to the appropriate governmental agency(s).
16
DATA PROTECTION
16.1
Sensitive personal data and processing shall be managed according to the Applicable Laws in each of the Territory.
17
ANTI BRIBERY
17.1
Each party warrants and represents to the other party that it:
(a)
has not committed an offence under any Anti-Bribery Law (a "Bribery Offence");
(b)
has not been formally notified that it is subject to an investigation relating to alleged Bribery Offences or 
prosecution or enforcement action under any Anti- Bribery Law;
(c)
is not aware of any circumstances that could give rise to an investigation relating to an alleged Bribery 
Offence or prosecution or enforcement action under any Anti-Bribery Law.
17.2
Each party agrees that it:

 
 
(a)
has in place, and shall maintain until termination of this Agreement, adequate documented procedures 
designed to prevent persons associated with such party (including an employee, sub-contractor or agent or 
other third party working on behalf of such party or any Affiliate) (an "Associated Person") from committing a 
Bribery Offence; and
(b)
shall comply with any applicable Anti-Bribery Law and shall not, and shall procure that no Associated Person 
shall, commit any Bribery Offence or any act which would constitute a Bribery Offence; and
(c)
comply with all compliance requirements and related operating procedures, direction and guidance for 
interaction with Healthcare Providers or Government Officials;
(d)
shall not do or permit anything to be done which would cause the other party or any of the other party’s 
employees, sub-contractors or agents to commit a Bribery Offence or incur any liability in relation to an act of 
bribery; and
(e)
shall not, directly or indirectly, make offer, promise, or authorise the payment or giving of any money or thing 
of value to any third party (which includes a Government Official or any Healthcare Provider or other person) 
for the purpose of obtaining any improper business advantage. Such purpose shall be deemed to exist if a 
payment or gift is made, offered, promised or authorized with the intent to or with the knowledge that it is 
likely to:
(i)
corruptly affect or influence any act or decision of a third party, including a decision to fail to
perform his or her lawful duty; or
(ii)
induce a third party to corruptly affect or influence any act or decision of any Public Authority or 
customer in order to assist Kyowa Kirin or UGNX in connection with the use or sale of the Product; 
and
(f)
shall notify the other party, to the extent legally practicable and permissible, immediately in writing if it 
becomes aware or has reason to believe that it has, or any of its Associated Persons have, breached or 
potentially breached any of the party’s obligations under this Clause 17. Such notice to set out full details, to 
the extent legally practicable and permissible under Applicable Laws and

 
 
Confidentiality obligations, of the circumstances concerning the breach or potential breach of such party’s 
obligations.
17.3
Each party acknowledges that no employee of the other party or any of its Affiliates has any authority to give any 
direction, written or oral, in contravention of the foregoing in connection with the making of any payment or 
commitment by the party to any third party.
17.4
Each party acknowledges that the failure of itself, its employees, agents, sub- distributors or other representatives to 
comply strictly with this Clause 17 shall be considered, if proven that a breach of this Clause 17 was actually 
committed, a material breach of this Agreement and the other party shall be entitled to terminate the Agreement in 
accordance with Clause 22.1. In addition, such failure may subject the other party and its Affiliates, employees, agents 
and other representatives to substantial fines, penalties, damages, expenses, the imposition of additional taxes or the
loss of tax deductions.
18
FORCE MAJEURE
18.1
A party will not be in breach of this Agreement nor liable for any failure or delay in performance of any obligations 
under this Agreement (and the date for performance of the obligations affected will be extended accordingly) as a 
result of Force Majeure, provided that such party complies with the obligations set out in this Clause 18 (Force 
Majeure). Save as provided in Clause 18.4, a Force Majeure will not entitle either party to terminate this Agreement.
18.2
The party affected by Force Majeure shall immediately notify the other in writing of the matters constituting the Force 
Majeure and shall keep that party fully informed of their continuance and of any relevant change of circumstances 
whilst such Force Majeure continues.
18.3
The party affected by Force Majeure shall take all reasonable steps available to it to minimise its effects on the 
performance of its obligations under this Agreement.
18.4
If Force Majeure continues for longer than [***] either party may, whilst the Force Majeure continues, immediately 
terminate this Agreement by notice in writing to the other.
19
LIABILITY
19.1
Nothing in this Agreement excludes or limits either party's liability for:
(a)
[***];
(b)
[***]; or
(c)
any liability that cannot legally be excluded or limited.
19.2
Subject to Clause 19.1, each party is not liable, whether in contract, tort (including negligence or breach of statutory 
duty), misrepresentation or otherwise in connection with this Agreement for any:
(a)
[***];
(b)
[***];
(c)
[***]; or
(d)
[***];

 
 
in each case whether direct or indirect, or for any indirect, special or consequential loss or damage, howsoever arising.
20
INDEMNITY
20.1
Indemnification by UGNX: UGNX shall indemnify, defend and hold harmless Kyowa Kirin, its Affiliates, and its and their
respective, directors, officers and employees (collectively “the Kyowa Kirin Indemnified Party”) against any and all 
claims, liabilities, losses, damages, costs or expenses, including reasonable attorneys’ fees, arising out of any claim or 
action brought by a third party (collectively, “Losses”) incurred or suffered by the Kyowa Kirin Indemnified Party to the 
extent arising out of or caused by:
(a)
the negligence, recklessness or intentional misconduct of UGNX or its Affiliates in connection with the 
importation, storage, sale, offer for sale and distribution of the Product in the Territory; or
(b)
the breach by UGNX of one or more of its representations, warranties or other material obligations under this 
Agreement,
except to the extent such Losses result from or arise out of (i) the inaccuracy of any representation of warranty of 
Kyowa Kirin set forth in this Agreement; (ii) the breach of any warranty or covenant contained in this Agreement by 
Kyowa Kirin; or (iii) the negligence, recklessness or intentional misconduct of Kyowa Kirin.
20.2
Indemnification by Kyowa Kirin: Kyowa Kirin shall indemnify, defend and hold harmless UGNX, its Affiliates, and its and 
their respective, directors, officers and, employees (collectively “the UGNX Indemnified Party”) against any and all 
Losses (as defined above) incurred or suffered by the UGNX Indemnified Party to the extent arising out of or caused by:
(a)
the negligence, recklessness or intentional misconduct of Kyowa Kirin or its Affiliates in connection with the 
manufacturing, quality control, release and supply of the Product;
(b)
a deficiency in the Product, provided that this shall not extend to any Loss arising out of or related to (i) [***], 
or (ii) [***];
(c)
the breach by Kyowa Kirin of one or more of its representations, warranties or other material obligations 
under this Agreement; or
(d)
any infringement claim made, brought or threatened against UGNX as a result of an alleged or actual 
infringement of a third party’s Intellectual Property Right, to the extent such infringement claim (and related 
Losses) arises out of UGNX’s importation, storage, sale, offer for sale, distribution, marketing, use, or 
promotion of the Product in the Territory in accordance with the MA,

 
 
except to the extent such Losses result from or arise out of (i) the inaccuracy of any representation of warranty of 
UGNX set forth in this Agreement; (ii) the breach of any warranty or covenant contained in this Agreement by UGNX; 
or (iii) the negligence, recklessness or intentional misconduct of UGNX.
20.3
Notification of Liabilities/Losses: In the event that either party intends to seek indemnification for any claim under any 
of Clauses 20.1 or 20.2, it shall inform the other party of the claim promptly after receiving notice of the claim.
20.4
In the case of a claim for which Kyowa Kirin seeks indemnification under Clause 20.1, upon UGNX’s request, Kyowa 
Kirin shall permit UGNX to direct and control the defence of any claim and shall provide such reasonable assistance as 
is reasonably requested by UGNX (at UGNX’s cost) in the defence of the claim; provided that nothing in this Clause 
20.4 shall permit UGNX to make any admission on behalf of Kyowa Kirin, or to settle any claim or litigation which 
would impose any financial obligations on Kyowa Kirin without the prior written consent of Kyowa Kirin, such consent 
not to be unreasonably withheld or delayed. Notwithstanding the foregoing, Kyowa Kirin may participate at its own 
expense in the defense and any settlement discussions.
20.5
In the case of a claim for which UGNX seeks indemnification under Clause 20.2, upon Kyowa Kirin’s request, UGNX shall 
permit Kyowa Kirin to direct and control the defence of the claim and shall provide such reasonable assistance as is 
reasonably requested by Kyowa Kirin (at Kyowa Kirin’s cost) in the defence of the claim, provided always that nothing 
in this Clause 20.5 shall permit Kyowa Kirin to make any admission on behalf of UGNX, or to settle any claim or 
litigation which would impose any financial obligations on UGNX without the prior written consent of UGNX, such 
consent not to be unreasonably withheld or delayed. Notwithstanding the foregoing, UGNX may participate at its own 
expense in the defense and any settlement discussions.
20.6
Neither party limits or excluded its liability for fraudulent misrepresentation nor for death or personal injury arising 
from its negligence.
20.7
Exclusive Remedy: Each party agrees that its sole and exclusive remedy with respect to any Losses shall be pursuant to 
the indemnification provision of this Clause 20. For clarity, no remedies with respect to claims or losses other than 
Losses shall be limited by this Clause 20.7.
21
INSURANCE
21.1
UGNX and Kyowa Kirin shall maintain sufficient insurances with reputable providers to cover any and all liabilities 
arising out of or in connection with this Agreement, including [***].
22
TERMINATION
22.1
If the Collaboration Agreement is terminated, either party may immediately terminate this Agreement without 
payment of compensation of other damages caused to the other party solely by such termination by giving notice in 
writing to the other party. Notwithstanding any other provision, all amounts payable to Kyowa Kirin under the 
Agreement shall remain due upon termination of this Agreement for whatever reason pursuant to the payment terms 
set forth herein.
22.2
It is expressly agreed that, to the maximum extent permitted by the laws within the Territory, termination of this 
Agreement (in accordance with the terms of this Agreement) at any time and for whatever reason shall not entitle 
[***] in accordance with or in relation to this Agreement.
23
CONSEQUENCES OF TERMINATION
23.1
The Termination of this Agreement will be without prejudice to the rights and remedies of 

 
 
either party that may have accrued up to the date of termination.
23.2
On Termination of this Agreement for any reason whatsoever:
(a)
subject to Clause 23.1, the relationship of the parties will cease and any rights or licences granted under or 
pursuant to this Agreement will cease to have effect save as (and to the extent) expressly provided for in this 
Clause 23;
(b)
any provision which expressly or by implication is intended to come into or remain in force on or after 
termination will continue in full force and effect;
(c)
subject to Clause 23.2(d) each of the parties shall immediately return to the other party (or, if the other party 
so requests by notice in writing, destroy) all of the other party's property in its possession at the date of 
termination, including all of its Confidential Information, together with all copies of such Confidential 
Information and shall certify that it has done so, and shall make no further use of such Confidential 
Information; and
(d)
if a party is required by any Applicable Laws, regulation or government or regulatory body to retain any 
documents or materials which it would otherwise be required to return or destroy by Clause 23.2(c), it shall 
notify the other party in writing of such retention, giving details of the documents or materials that it must 
retain; and
24
CONFIDENTIALITY
24.1
Each party shall keep and procure to be kept secret and confidential all Confidential Information belonging to the other 
party disclosed or obtained as a result of the relationship of the parties under this Agreement and shall not use nor 
disclose the same save for the purposes of the proper performance of this Agreement or with the prior written 
consent of the other party.
24.2
The parties may disclose Confidential Information to an employee, Affiliate, consultant or agent to the extent 
necessary for the performance of this Agreement provided such disclosure is subject to obligations equivalent to those 
set out in this Agreement. Each party shall use its best endeavours to procure that any such employee, consultant or 
agent complies with such obligations. Each party will be responsible to the other party in respect of any disclosure or 
use of such Confidential Information by a person to whom disclosure is made.
24.3
The obligations of confidentiality in this Clause 24 do not extend to any Confidential Information that the party that 
wishes to disclose or use can show:
(a)
is or becomes generally available to the public other than as a result of a breach of the obligations of 
confidentiality under this Agreement; or
(b)
was in its written records prior to the date of this Agreement and not subject to any confidentiality 
obligations; or
(c)
was or is disclosed to it by a third party entitled to do so; or
(d)
the parties agree in writing is not Confidential Information or may be disclosed; or
(e)
is required to be disclosed under any Applicable Law, or by order of a court or governmental body or 
authority of competent jurisdiction.
24.4
Press Releases. UGNX and Kyowa Kirin shall consult in advance and reasonably cooperate in the method and manner 
of any press release regarding this Agreement and any activity related thereto. For clarity, following any press release 
issued pursuant to this Clause 24.4, UGNX and Kyowa Kirin may each disclose to third parties the information set forth 
in such 

 
 
press release without the need for further approval by the other. Notwithstanding the foregoing, each party may make 
filings to the U.S. Securities and Exchange Commission (SEC) or similar requirements under Applicable Law, provided, 
that such party shall ensure that any such release will be limited in its disclosure only to information that is required 
for such disclosing party to be in compliance with Applicable Law.
25
PARTIES
25.1
This Agreement may not be assigned by either of the parties without the prior written consent of the other party; 
provided, however, either party may assign this Agreement in its entirety without such consent to any of its Affiliates, 
to any purchaser of all, or substantially all, of its assets or to any successor corporation resulting from any merger, 
consolidation, share exchange, or other similar transaction, and provided further that either party may assign or sell its 
rights to receive any amounts due hereunder.
25.2
A person who is not a party to this Agreement has no rights to enforce any provision of this Agreement.
25.3
The rights of the parties to terminate, rescind or agree any variation, waiver or settlement under this Agreement are 
not subject to the consent of any person that is not a party to this Agreement.
25.4
Neither party may pledge the credit of the other party nor represent itself as being the other party nor an agent, 
partner, employee or representative of the other party and neither party may hold itself out as such nor as having any 
power or authority to incur any obligation of any nature, express or implied, on behalf of the other. Nothing in this 
Agreement, and no action taken by the parties pursuant to this Agreement creates, or is deemed to create, a 
partnership or joint venture or relationship of employer and employee or principal and agent between the parties.
26
CONSTRUCTION AND INTERPRETATION OF THIS AGREEMENT
26.1
Entire Agreement
(a)
This Agreement contains the entire agreement between the parties in relation to its subject matter and 
supersedes any prior arrangement, understanding written or oral agreements between the parties in relation 
to such subject matter.
(b)
The parties acknowledge that this Agreement has not been entered into wholly or partly in reliance on, nor 
has either party been given, any warranty, statement, promise or representation by the other or on its behalf 
other than as expressly set out in this Agreement.
(c)
All warranties and conditions, terms and conditions not set out in this Agreement whether implied by statute 
or otherwise are excluded to the extent permitted by law.
(d)
Nothing in this Clause 26 will exclude any liability in respect of misrepresentations made fraudulently.
26.2
Precedence
(a)
In the event of a conflict or ambiguity the order of precedence for this Agreement and the documents 
attached to or referred to in this Agreement are as follows:
(i)
first the Clauses of this Agreement; and
(ii)
then second the Schedules to this Agreement.

 
 
(iii)
then the Quality Agreement
(b)
Notwithstanding the foregoing, in the event of a conflict or ambiguity between any term of this Agreement 
(including anything contained within its Schedules) and the Quality Agreement or pharmacovigilance 
agreement concerning the Product, the term provided in the Quality Agreement or pharmacovigilance 
agreement shall take precedence in as far as the conflict or ambiguity concerns a quality or pharmacovigilance 
matter respectively.
26.3
Severability of Provisions

 
 
If at any time any part of this Agreement is held to be or becomes void or otherwise unenforceable for any reason 
under any applicable law, the same shall be deemed omitted from this Agreement and the validity and/or 
enforceability of the remaining provisions of this Agreement shall not in any way be affected or impaired as a result of 
that omission.
26.4
Waiver
The rights and remedies of either party in respect of this Agreement shall not be diminished, waived or extinguished 
by the granting of any indulgence, forbearance or extension of time granted by that party to the other nor by any 
failure of, or delay in ascertaining or exercising any such rights or remedies. Any waiver of any breach of this 
Agreement shall be in writing. The waiver by either party of any breach of this Agreement shall not prevent the 
subsequent enforcement of that provision and shall not be deemed to be a waiver of any subsequent breach of that 
or any other provision.

 
 
27
CONTRACT ADMINISTRATION
27.1
Variation
No purported alteration or variation of this Agreement shall be effective unless it is in writing, refers specifically to this 
Agreement and is signed by a director of each of the parties to this Agreement.
27.2
Language
This Agreement is entered into in the English language. All amendments or correspondence concerning or relating to 
this Agreement and all notices given and all documentation to be delivered by either party to the other under this 
Agreement shall be in writing in the English language or shall be accompanied by an English translation prepared by 
such person or body as the parties shall have approved in advance. If there is any conflict in meaning between the 
English language version and any version or translation of this Agreement in any other language the English version 
shall prevail.
27.3
Counterpart Signatures
This Agreement may be executed in any number of counterparts, each of which when executed shall constitute an 
original of this Agreement, but all the counterparts together constitute the same Agreement. No counterpart shall be 
effective until each party has executed at least one counterpart.
27.4
Further Actions Required
Each of the parties shall, and shall use their reasonable endeavours to procure that any necessary third parties shall, 
execute and deliver to the other party such other instruments and documents and take such other action as may 
reasonably be required for the purpose of giving full effect to this Agreement.
27.5
Notices
(a)
Any notices sent under this Agreement must be in writing.
(b)
Notices may be served in the ways set out below at the addresses set out at the top of this Agreement or at 
such other address as the relevant party may give notice to the other party for the purpose of service of 
notices under this Agreement and, the following table sets out the respective deemed time and proof of 
service:
 
Manner of Delivery
Deemed time of delivery
Proof of Service
Personal delivery/Cour
On delivery provided delivery between 
9.00am and 5.00pm on Business Day
properly addressed and delivered
Prepaid international mail 
postal service
9.00am on the fifth Business D after posting
properly	addressed	
prepaid	 a posted
 
(c)
For the purpose of Clause 27.5(b) and calculating deemed receipt all references to time are local time in the 
place of deemed receipt.

 
 
28
DISPUTE RESOLUTION PROCEDURE
28.1
Disputes. The parties recognize that disagreements as to certain matters may from time to time arise out of this 
Agreement. The parties agree that such disagreements are to be governed in accordance with this Clause 28. 
Disagreements that are claims, counterclaims, demands, causes of action, disputes or controversies both arising out of 
this Agreement and related to the performance, enforcement, breach or termination of this Agreement are each, a 
“Dispute”. For the avoidance of doubt, Dispute does not include any claims, counterclaims, demands, causes of action,
disputes or controversies regarding a party’s use of any Intellectual Property Rights of the other party, where such use 
is not expressly granted by the other party.
28.2
In the event of any Dispute under this Agreement, the parties shall refer such dispute to [***] for attempted resolution
by good faith negotiations within [***] days after such referral is made.
28.3
Agreement to Arbitrate. If the parties fail to resolve any Dispute pursuant to Clause 28.2, either party may submit that 
Dispute for final resolution by binding arbitration administered by the International Chamber of Commerce (“ICC”) in 
accordance with its Rules of Arbitration (the “Rules”) then in force, to the extent such Rules are not inconsistent with 
the provisions of this Agreement.
28.4
Number and Appointment of Arbitrators. Except as provided by this Clause 28.4 or in Clause 28.5, the appointment 
and confirmation of the arbitrators shall be made in accordance with the relevant provisions of the Rules. The arbitral 
tribunal shall be composed of three (3) arbitrators (the “Tribunal”) to be appointed in accordance with the Rules, 
except as expressly provided for herein. Each party shall select one (1) arbitrator from the list of available ICC 
arbitrators and such arbitrators shall jointly appoint the third arbitrator who shall act as the chairman of the Tribunal 
(the “Chairman”). In the event any arbitrator becomes unable to serve, that arbitrator will be replaced in the same 
manner in which he or she was appointed. If either party fails to appoint an arbitrator within [***] days of the 
initiation of arbitration, the other party may request the ICC to appoint such co-arbitrator (for the non-responsive 
party). Such appointment shall be binding on the parties. If the arbitrators selected by the parties cannot agree on a 
Chairman within [***] days after they have been selected, then the ICC shall appoint the Chairman upon request by 
either party.
28.5
Confidentiality. Except to the extent necessary for proceedings relating to enforcement of the arbitration agreement, 
the award, or other related rights of the parties, the fact of the arbitration, the arbitration proceeding itself, all 
evidence, written statements or other documents exchanged or used in the arbitration and the Tribunal’s award will 
be maintained in confidence by the parties to the fullest extent permitted by law. However, a violation of this covenant 
will not affect the enforceability of this agreement to arbitrate or of the Tribunal’s award.
28.6
Costs. Each party shall [***]. The Tribunal may also fix such costs and expenses proportionate to the extent each party 
prevails in the arbitration, as the circumstances may warrant. If a party fails to proceed with arbitration, unsuccessfully 
challenges the arbitration award or fails to comply with the arbitration award, the other party will be entitled to costs, 
including reasonable

 
 
attorneys’ fees and disbursements, for having to compel arbitration or defend or enforce the award.
28.7
Notwithstanding the provisions of this Clause 28, either party may (unless agreed otherwise in writing) take 
proceedings or seek remedies before the courts or any competent authority of any country for injunctive relief or 
interlocutory remedies in relation to any breach of this Agreement or infringement by the other party of that party’s 
Intellectual Property Rights, confidentiality rights or other such rights that without which would otherwise result in 
substantial financial or commercial harm.
29
LAW AND JURISDICTION
29.1
Resolution of all disputes arising out of or related to this Agreement or the performance, enforcement, breach or 
termination of this Agreement and any remedies relating thereto, will be governed by and construed under the 
substantive laws of the State of New York, U.S.A., without reference to any choice of law principles thereof that would 
cause the application of the laws of a different jurisdiction.
 
IN WITNESS OF THE ABOVE the parties have signed this Agreement on the date written at the head of this Agreement.
 
 
SIGNED for and on behalf of KYOWA KIRIN
/s/ Tara D’Orsi 
Name: Tara D’Orsi
Title: General Counsel KYOWA KIRIN, INC.
 
 
SIGNED for and on behalf of UGNX by
 
/s/ Siegfried Hackl
 
Name: Siegfried Hackl Title: SVP Product 
Supply
ULTRAGENYX PHARMACEUTICAL INC.
 

 
 
SCHEDULE 1
 
Price and Payment
 
1.
MINIMUM SUPPLY PRICE
 
Product
Price
 
KRN23 in all commercialized formulations, including, but not limited 
to 10mg, 20mg and 30mg presentations, in fully-finished form
 
USD$[***] per vial
 
 
2.
PAYMENT AND ROYALTIES
(a)
Within [***] days of delivery of Product to UGNX by Kyowa Kirin, Kyowa Kirin will invoice and UGNX shall pay 
an amount equal to the Minimum Supply Price multiplied by the number of naked vials of Product delivered 
(the “Total Minimum Supply Price”).
(b)
In the event that the Total Minimum Supply Price in the relevant [***] is less than the Agreed Supply Price, 
UGNX shall [***] within [***] days of the end of [***].
(c)
In the event that the Total Minimum Supply Price is greater than the Agreed Supply Price, Kyowa Kirin shall 
[***] within [***] days of the end of [***].
3.
NET SALES
3.1
"Net Sales" means, with respect to the Product, the gross amounts invoiced by UGNX or its Affiliates ("Selling Party") 
to any third party for sales of the Product in the Territory (for the avoidance of doubt, to include any revenue received 
in relation to supply of the Product in the Territory, whether or not strictly deemed a sale), less the following items, 
provided that they are bona fide:
(a)
actual credits, refunds or allowances to third party customers for spoiled, damaged, rejected, recalled, 
outdated and reasonably returned Product;
(b)
discounts, including cash, volume, quantity and other trade discounts, charge- back payments, and rebates 
and allowances actually granted, incurred or allowed in the ordinary course of business, as well as 
government-required discounts and allowances (including government rebates and other price reductions), 
and other reductions, concessions and allowances that effectively reduce the selling price to the Selling Party;
(c)
transportation charges, freight, postage and insurance (but only insurance related to protecting the particular 
shipment against physical loss or damage); and
(d)
sales, use or excise taxes and import/export duties or tariffs and similar governmental charges actually due or 
incurred in connection with the sales of such Product.
3.2
Components of Net Sales shall be determined in the ordinary course of business in accordance with GAAP (as 
applicable in the country of sale), consistently applied.
3.3
Net Sales shall include, for the Product, [***].

 
 
3.4
For the purposes of determining when a sale of any Product occurs for purposes of calculating Net Sales, the sale will
be [***]. For purposes of this Agreement, “Accounting Standards” means U.S. generally accepted accounting principles 
as consistently applied throughout the applicable periods indicated herein by or on behalf of the relevant Selling Party.
3.5
For the purposes of determining Net Sales, a "sale" shall not include transfers or dispositions, at no cost or below cost, 
of the Product for charitable, compassionate, non-clinical, clinical or regulatory purposes or for promotional samples 
or free goods.
3.6
Amounts invoiced by the Selling Party for the sale of Product to another Affiliate for resale to a third party shall not be 
included in the computation of Net Sales hereunder.
3.7
In the event that the Selling Party sells the Product:
(a)
to a third party in a bona fide arm's length transaction, for material consideration, in whole or in part, other 
than cash (but excluding, for the avoidance of doubt, consideration in the form of non-financial legal terms 
and conditions incident to sale including, for clarity, the supply of Product for non- commercial purposes 
substantially at cost);
(b)
to a third party in other than a bona fide arm's length transaction; or
(c)
with discounts of Product that are disproportional to the discounts of other products sold by the Selling Party 
in conjunction with such Product,

 
 
then the Net Sales price for such Product shall be deemed to be the standard invoice price then being invoiced by the 
Selling Party in an arm's length transaction with similar customers in the Territory, less typical deductions as 
accounted for in 3.1(a)(c) and (d).
 
3.8
In the event that the Selling Party includes one or more Product as part of a bundle of products, the price for such 
Product shall be deemed to be the standard invoice price for such Product when sold separately and not as part of a 
bundle of products. In the event that no separate prices are charged in the applicable transaction, then Net Sales for 
such bundle shall be determined based on the list price for the Product and the other products or services in the 
relevant county during the accounting period in which the sale was made. If no list price exists in such country for the 
Product or the other products or services that are part of the bundle, then Net Sales for such bundle shall

 
 
be equitably determined based on the fair market value of the Product relative to that of the other products or 
services.
3.9
Any dispute between the parties with respect to the determination of such market value shall be finally resolved 
pursuant to Clause 28 of the Agreement.
4.
RECORDS AND AUDIT RIGHT
4.1
UGNX will maintain complete and accurate records in sufficient detail to permit Kyowa Kirin to confirm the accuracy of 
the calculation of payments under this Agreement. Upon reasonable prior notice, such records shall be available 
during regular business hours for a period of [***] from the end of the calendar year to which they pertain for 
examination at the expense of Kyowa Kirin, and not more often than [***] each [***], for the sole purpose of verifying 
the amounts payable hereunder (e.g. the calculation of the Total Minimum Supply Price and Net Sales) and may 
include the use of an independent certified public accountant selected by Kyowa Kirin and reasonably acceptable to 
UGNX. Any such auditor shall not disclose UGNX’s Confidential Information, except to the extent such disclosure is 
necessary to verify the accuracy of the financial reports furnished by UGNX or the amount of payments due under this 
Agreement during the prior [***]. Any amounts shown to be owed but unpaid shall be paid within [***] from the 
accountant’s report, [***] (as set forth in Clause 10.5 of the Agreement) from the original due date, unless challenged 
as provided below. Any amounts shown to have been overcharged or overpaid shall be refunded within [***] from the 
accountant’s report. [***].
4.2
If UGNX challenges the results of the audit in good faith, UGNX shall be entitled [***] to obtain a second independent 
certified public accountant to confirm the accuracy of the first audit. If the results of the confirmatory audit are 
substantially similar to the results of the first audit, any amounts owed by UGNX shall be paid in accordance with the 
procedures above. If the results of the confirmatory audit are not substantially similar to the results of the first audit, 
each party shall cause its respective auditors to identify the discrepancy and to agree on a final amount owed (as the 
case may be) by UGNX that shall be final and binding on the parties. If the auditors cannot resolve the discrepancy, the 
parties shall mutually agree on a third independent certified public accountant to audit the discrepancy and provide a 
final amount owed (as the case may be) by UGNX, which shall be binding on the parties. The costs of such third audit 
shall be [***]. Amounts owed or overpaid as determined by such final audit shall be paid or refunded in accordance 
with the procedures above
5.
[***] REPORTING
5.1
UGNX shall provide Kyowa Kirin with a [***] Report within [***] days of the end of each [***].
5.2
"[***] Report" means a report which sets out, as a minimum, the following information:
(a)
Unit sales of the Product in the Territory during the previous [***]; and
(b)
Net Sales of the Product in the Territory during the previous [***].
6.
EXCHANGE RATE
6.1
The rate of exchange to be used in computing the amount of currency equivalent in US Dollars owed to a party for 
royalties and Agreed Supply Price under this Agreement shall be equal to the average exchange rate, over the 
applicable Quarter, between each currency of origin and USD as reported by [***] or an equivalent resource as agreed 
by the parties, on the last Business Day of the [***] in which the applicable Net Sales were made.

 
 
1
Exhibit 10.16
 
[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) 
THE TYPE THAT THE REGISTRANT TREATS A PRIVATE OR CONFIDENTIAL.
 
AMENDMENT NO.1 TO SUPPLY AGREEMENT
This Amendment No.1 to the Supply Agreement (“Amendment No.1”), effective as of September 13, 2024 (“Effective Date”), 
is made and entered into by and between Kyowa Kirin, Inc., a corporation organized and existing under the laws of Delaware, having 
its principal place of business at 510 Carnegie Center, Princeton, NJ 08540 (“Kyowa Kirin”) and Ultragenyx Pharmaceutical Inc., a 
company organized and existing under the laws of Delaware, having its principal place of business at 60 Leveroni Court, Novato, CA 
94949 (“UGNX”). UGNX and Kyowa Kirin may be referred to herein individually as a “Party” or collectively as the “Parties.”
WHEREAS, UGNX and Kyowa Kirin entered into that certain Supply Agreement made as of October 27, 2020 (“Agreement”).
WHEREAS, the Parties wish to hereby amend the Agreement as set forth below.
 
NOW, THEREFORE, in consideration of the promises, the mutual covenants contained herein and other valuable 
consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree to amend the Agreement as 
follows:
1.
Section 1.1 in the Agreement is hereby amended to include the following definition:
“Warehouse A Product handling and/or storage location directly managed by Kyowa Kirin or indirectly managed through 
Kyowa Kirin’s approved supplier network, whereby Kyowa Kirin’s approved supplier having previously 
satisfied the requirements of Kyowa Kirin’s supplier audit criteria and supported by an appropriate quality 
technical agreement;”
2.
Section 6.1 in the Agreement is hereby deleted in its entirety and replaced with the following:
 
“6.1 During the Term of this Agreement, Kyowa Kirin shall supply Product as naked, unlabelled product. Product will be 
supplied to UGNX from the bulk drug Product supply maintained or made available at Kyowa Kirin’s Warehouse (as defined 
herein) or Kyowa Kirin’s approved third-party packaging facility(ies) as outlined in Section 7.2. Kyowa Kirin agrees to 
maintain an inventory of sufficient Product as mutually agreed through the joint sales and operations planning process.”
3.
Section 7.2 in the Agreement is hereby deleted in its entirety and replaced with the following:
 
“7.2 Product will be shipped by Kyowa Kirin [***] to a regional packaging facility located in [***] or to a Kyowa Kirin 
qualified Warehouse in the United States, or to the Kyowa Kirin regional packaging facility located in [***], or to any other 
such Kyowa Kirin packaging facility as approved in advance by UGNX. Kyowa Kirin will coordinate the shipment of the 
Product into the United States and the Product receipt at Kyowa Kirin’s qualified Warehouse or packaging facility. Products 
shall be made available to UGNX from Kyowa Kirin approved inventory, having already 

 
 
2
been transported from the point of manufacture using Kyowa Kirin qualified shipping lanes.”

 
 
3
4.
Section 7.3 in the Agreement is hereby deleted in its entirety and replaced with the following:
 
“7.3 All Product supplied by Kyowa Kirin that is (i) shipped from the regional packaging facility located at [***] shall be 
examined and checked upon transfer or delivery to UGNX (or its designee at the regional packaging site) and (ii) shipped 
from a qualified Kyowa Kirin Warehouse, shall be examined and checked upon transfer or delivery to UGNX’s packaging 
facility at [***] in order to ascertain that the Product complies with the lot release information, quantity, and Inventory 
Acceptance Requirements.”
 
5.
Section 8.1 in the Agreement is hereby deleted in its entirety and replaced with the following:
 
“8.1 Title and risk of loss to Products shall pass to UGNX upon transfer or delivery to UGNX or its designee at: (i) the regional 
packaging facility located in [***] for the Products shipped to such facility, or (ii) at Kyowa Kirin’s Warehouse for the 
Products shipped to Kyowa Kirin’s Warehouse for further shipment by UGNX to UGNX packaging facility at [***] .”
 
6.
Except as expressly provided in this Amendment No.1, all other terms, conditions and provisions of the Agreement shall 
continue in full force and effect as provided therein. Capitalized terms used in this Amendment No.1 that are not otherwise 
defined herein, shall have the meanings assigned to them in the Agreement.
 
7.
This Amendment No. 1 shall inure to the benefit of, and be binding upon, the Parties hereto and their respective heirs, 
successors, trustees, transferees and assigns.
 
8.
This Amendment No.1 may be executed in two or more counterparts, each of which shall be deemed an original and all of 
which shall constitute together the same instrument. The Parties to this Amendment No.1 agree that a copy of the original 
signature (including an electronic copy) may be used for any and all purposes for which the original signature may have been 
used. The Parties agree they will have no rights to challenge the use or authenticity of this document based solely on the 
absence of an original signature.
 
[Signature page follow on next page]

 
 
4
IN WITNESS WHEREOF, the Parties have duly authorized persons executed this Amendment No.1 as of the Effective Date.
 
ULTRAGENYX PHARMACEUTICAL INC.
KYOWA KIRIN, INC.
 
 
 
 
By: /s/ Siegfried Hackl
 
 
 
 
By: /s/ Paul Jesta 
 
 
 
Siegfried Hackl
 
 
Printed Name
 
 
 
Paul Jesta 
 
 
Printed Name
 
 
 
SVP Product Supply
 
 
Title
 
 
 
EVP - Operations
 
 
Title
 
 
 
13-Sep-2024
 
 
Date
 
 
 
19-Sep-2024
 
 
Date
 

 
 DOCPROPERTY "DOCID" \* MERGEFORMAT 104440673.3
Exhibit 10.38

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE 
INFORMATION (I) IS NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS A PRIVATE OR CONFIDENTIAL.
Name:	 [●]
Target Number of Performance Stock Units subject to Award:	
[●]
Date of Grant:	
[●]	
ULTRAGENYX PHARMACEUTICAL INC.
2023 INCENTIVE PLAN
PERFORMANCE STOCK UNIT AGREEMENT (2024)
This agreement (this “Agreement”) evidences an award (the “Award”) of performance stock units (the “Performance Stock Units”) granted by 
Ultragenyx Pharmaceutical Inc. (the “Company”) to the undersigned (the “Grantee”) pursuant to and subject to the terms of the Ultragenyx Pharmaceutical 
Inc. 2023 Incentive Plan (as amended from time to time, the “Plan”), which is incorporated herein by reference.
1. Grant of Performance Stock Units.  The Company grants to the Grantee on the date set forth above (the “Date of Grant”) an award consisting 
of the right to receive on the terms provided herein and in the Plan, one share of Stock with respect to each Performance Stock Unit forming part of the 
Award, in each case, subject to adjustment pursuant to Section 7(b) of the Plan in respect of transactions occurring after the date hereof.
2. Meaning of Certain Terms.  Except as otherwise defined herein, all capitalized terms used herein have the same meaning as in the Plan. 
3. Vesting.  
(a)
Unless earlier terminated, forfeited, relinquished or expired, and subject to the Grantee’s continued employment through the 
applicable vesting dates, (i) 1/3 (or 33.4%) of the Performance Stock Units shall vest in accordance with Section 3(b) (the “Revenue PSUs”), (ii) 1/3 (or 33.3%) 
of the Performance Stock Units shall vest in accordance with Section 3(c) (the “TSR PSUs”) and (iii) 1/3 (or 33.3%) of the Performance Stock Units shall vest in 
accordance with Section 3(d) (the “Strategic PSUs”).
(b)
The Revenue PSUs shall vest as follows:
(i)
If the Administrator certifies that the revenue performance metric set forth in Appendix A attached hereto (the 
“Revenue Vesting Metric”) has been achieved at at least the threshold level of performance during the period 
beginning on January 1, 2024 and ending on December 31, 2025 (the “Revenue Performance Period”), 100% of the 
Earned Revenue PSUs (as determined pursuant to Appendix A) shall vest on the later of (x) the date on which the 
Administrator certified such achievement and (y) March 1, 2026. 
Notwithstanding anything to the contrary in this Section 3(b), in the event that the Company fails to achieve the threshold level of performance under the 
Revenue Vesting Metric during the Revenue Performance Period, the 

2
vesting of the Revenue PSUs shall immediately cease and all of the Revenue PSUs shall be immediately forfeited as of the last day of the Revenue 
Performance Period.
(c)
If the Administrator certifies that the relative total stockholder return performance metric set forth in Appendix B attached 
hereto (the “TSR Vesting Metric”) has been achieved at at least the threshold level of performance during the period beginning on January 1, 2024 and 
ending on December 31, 2026 (the “TSR and Strategic Performance Period”), 100% of the Earned TSR PSUs (as determined pursuant to Appendix B) shall vest 
on the later of (x) the date on which the Administrator certified such achievement and (y) March 1, 2027. 
(d)
If the Administrator certifies that the strategic performance metric set forth in Appendix C attached hereto (the “Strategic 
Vesting Metric”) has been achieved by at least the threshold level of performance during the TSR and Strategic Performance Period, 100% of the Earned 
Revenue PSUs (as determined pursuant to Appendix C) shall vest on the later of (x) the date on which the Administrator certified such achievement and (y) 
March 1, 2027.
Notwithstanding anything to the contrary in this Section 3(d), in the event that the Company fails to achieve the threshold level of performance under the 
Strategic Vesting Metric during the TSR and Strategic Performance Period, the vesting of the Strategic PSUs shall immediately cease and all of the Strategic 
PSUs shall be immediately forfeited as of the last day of the TSR and Strategic Performance Period.
(e)
Notwithstanding anything to the contrary in Section 3(b), Section 3(c) and Section 3(d) above and subject to the conditions set 
forth below, if the Company consummates a Covered Transaction prior to the end of the Revenue Performance Period and/or TSR and Strategic Performance 
Period, the Performance Stock Units granted hereby that have not otherwise vested or been terminated, forfeited, relinquished or expired prior to the 
Covered Transaction shall automatically become a number of time-vested restricted stock units (“Restricted Stock Units”) assuming the greater of (i) the 
target level of performance or (ii) (x) with respect to the Revenue Vesting Metric and the Strategic Vesting Metric, the expected (as determined by the 
Administrator) level of performance and (y) with respect to the TSR Vesting Metric, the actual level of performance through the date of the Covered 
Transaction, which Restricted Stock Units shall vest on the first anniversary of the Covered Transaction, subject to Grantee’s continued employment through 
that date. If the Administrator certifies that the Revenue Vesting Metric and/or the Strategic Vesting Metric has been achieved during the Revenue 
Performance Period and TSR and Stratetic Performance Period, as applicable, and prior to the Covered Transaction, the applicable time-based vesting dates 
for those Earned Performance Stock Units shall not be affected by any Covered Transaction, and such Earned Performance Stock Units shall continue to vest 
based on their applicable time-based vesting dates.    
4. Delivery of Stock.  The Company shall deliver to the Grantee as soon as practicable upon the vesting of the Performance Stock Units (or, if 
applicable, Restricted Stock Units) or any portion thereof, but in all events no later than March 15th of the year following the year in which such units vest, 
one share of Stock with respect to each such vested unit, subject to the terms of the Plan and this Agreement.
5. Dividends; Other Rights.  The Award shall not be interpreted to bestow upon the Grantee any equity interest or ownership in the Company or 
any Affiliate prior to the date on which the Company delivers shares of Stock to the Grantee (if any).  The Grantee is not entitled to vote any shares of Stock 
by reason of the granting of this Award or to receive or be credited with any dividends declared and payable on any share of Stock prior to the date on which 
any such share is delivered to the Grantee hereunder.  The Grantee shall have the rights of a shareholder only as to those shares of Stock, if any, that are 
actually delivered under this Award.
6. Forfeiture; Recovery of Compensation.
(a)
The Administrator may cancel, rescind, withhold or otherwise limit or restrict the Award at any time if the Grantee is not in 
compliance with all applicable provisions of this Agreement and the Plan.

3
(b)
By accepting the Award the Grantee expressly acknowledges and agrees that his or her rights, and those of any permitted 
transferee of the Award, under the Award to any Stock acquired under the Award or proceeds from the disposition thereof, are subject to (i) Section 6(a)(5) 
of the Plan (including any successor provision) and (ii) recoupment in accordance with any clawback policy adopted by the Company, as may be modified 
from time to time by the Company in its discretion.  Nothing in the preceding sentence shall be construed as limiting the general application of Section 10 
hereof.  No recovery of compensation under a clawback policy or under Section 6(a)(5) of the Plan will be an event giving rise to a right to resign for “good 
reason” or “constructive termination” (or similar term) under any agreement with the Company
7. Nontransferability.  Neither the Award nor the Performance Stock Units (or, if applicable, Restricted Stock Units) may be transferred except as 
expressly permitted under Section 6(a)(3) of the Plan.
8. Certain Tax Matters.
(a)
The Grantee expressly acknowledges and agrees that the Grantee’s rights hereunder, including the right to be issued shares of 
Stock upon the vesting of the Performance Stock Units (or, if applicable, Restricted Stock Units) (or any portion thereof), are subject to the Grantee’s 
promptly paying, or in respect of any later requirement of withholding being liable promptly to pay at such time as such withholdings are due, to the 
Company in cash (or by such other means as may be acceptable to the Administrator in its discretion) all taxes required to be withheld, if any (the “Tax 
Withholding Obligation”).  No shares of Stock will be transferred pursuant to the vesting of the Performance Stock Units (or, if applicable, Restricted Stock 
Units) (or any portion thereof) unless and until the Grantee or the person then holding the Award has remitted to the Company an amount in cash sufficient 
to satisfy any federal, state, or local withholding tax requirements then due and has committed (and by accepting this Award the Grantee shall be deemed to 
have committed) to pay in cash all tax withholdings required at any later time in respect of the transfer of such shares, or has made other arrangements 
satisfactory to the Company with respect to such taxes.  The Grantee also authorizes the Company and its subsidiaries to withhold such amount from any 
amounts otherwise owed to the Grantee, but nothing in this sentence shall be construed as relieving the Grantee of any liability for satisfying his or her 
obligations under the preceding provisions of this Section 8.
(b)
The Grantee expressly acknowledges that the Grantee’s acceptance of this Agreement constitutes the Grantee’s instruction and 
authorization to the Company and any brokerage firm determined acceptable to the Company for such purpose to sell on the Grantee’s behalf a whole 
number of shares from those shares of Stock issuable to the Grantee as the Company determines to be appropriate to generate cash proceeds sufficient to 
satisfy the applicable Tax Withholding Obligation, and to transfer the proceeds from the sale of such Stock from the Grantee’s securities account established 
with the brokerage service provider for the settlement of the Grantee’s vested Performance Stock Units (or, if applicable, Restricted Stock Units) to any 
account held in the name of the Company.  Such shares will be sold on the date of vesting or as soon thereafter as practicable.  Grantee will be responsible 
for all brokers’ fees and other costs of sale, which fees and costs may be deducted from the proceeds of the foregoing sale of Stock, and Grantee agrees to 
indemnify and hold the Company and any brokerage firm selling such Stock harmless from any losses, costs, damages, or expenses relating to any such sale.  
To the extent the proceeds of such sale exceed Grantee’s Tax Withholding Obligation, such excess cash will be deposited into the securities account 
established with the brokerage service provider for the settlement of Grantee’s vested Performance Stock Units (or, if applicable, Restricted Stock Units).  
Grantee acknowledges that the Company or its designee is under no obligation to arrange for such sale at any particular price, and that the proceeds of any 
such sale may not be sufficient to satisfy Grantee’s Tax Withholding Obligation.  Accordingly, Grantee agrees to pay to the Company as soon as practicable, 
including through additional payroll withholding, any amount of the Tax Withholding Obligation that is not satisfied by the sale of shares described above.  
Unless otherwise authorized by the Administrator in its sole discretion, the sale of Stock will be the primary method used by the Company to satisfy the 
applicable Tax Withholding Obligation.

4
(c)
The Grantee expressly acknowledges that because this Award consists of an unfunded and unsecured promise by the Company 
to deliver Stock in the future, subject to the terms hereof, it is not possible to make a so-called “83(b) election” with respect to the Award.
9. Effect on Employment.  Neither the grant of the Award, nor the issuance of Shares upon vesting of the Award, will give the Grantee any right to 
be retained in the employ or service of the Company or any of its Affiliates, affect the right of the Company or any of its Affiliates to discharge or discipline 
such Grantee at any time, or affect any right of such Grantee to terminate his or her Employment at any time.
10. Provisions of the Plan.  This Agreement is subject in its entirety to the provisions of the Plan, which are incorporated herein by reference.  A 
copy of the Plan as in effect on the Date of Grant has been furnished to the Grantee.  By accepting the Award, the Grantee agrees to be bound by the terms 
of the Plan and this Agreement.  In the event of any conflict between the terms of this Agreement and the Plan, the terms of the Plan shall control.
11. Acknowledgments.  The Grantee acknowledges and agrees that (a) this Agreement may be executed in two or more counterparts, each of 
which shall be an original and all of which together shall constitute one and the same instrument, (b) this agreement may be executed and exchanged using 
facsimile, portable document format (PDF) or electronic signature, which, in each case, shall constitute an original signature for all purposes hereunder and 
(c) such signature by the Company will be binding against the Company and will create a legally binding agreement when this Agreement is countersigned by 
the Grantee.
[The remainder of this page is intentionally left blank.]

 
[Signature Page to Performance Stock Unit Agreement]
 DOCPROPERTY "DOCID" \* MERGEFORMAT  
IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by its duly authorized officer.
ULTRAGENYX PHARMACEUTICAL INC.
By: 	
Name: 	
Title: 	
Dated: 	
Acknowledged and Agreed:
By: 	
	
[Grantee’s Name]

 
Appendix A to Performance Stock Unit Agreement
APPENDIX A
The performance metric applicable to the Revenue PSUs shall be GAAP revenue for the Company over the Revenue Performance Period, with the number of 
Earned Revenue PSUs equal to the number of Revenue PSUs subject to the Award multipled by the applicable percentage set forth in the following table:
 
Level of Performance
Aggregate GAAP Revenue  for 
FY 2024 and FY 2025
Earned Revenue PSUs
Threshold
$[***]
50%
Target
$[***]
100%
Maximum
$[***]
200%
(1)	 Company required to achieve the threshold target [***]. 
(2)	 For performance between threshold and target and between target and maximum, the percentage of the Revenue PSUs that become Earned Revenue 
PSUs will be determined on a straight-line interpolated basis.
 
(1)
(2)

 
Appendix B to Performance Stock Unit Agreement
APPENDIX B
The performance metric applicable to the TSR PSUs shall be the Company’s Total Stockholder Return (as defined below) relative to the Total Stockholder 
Return of the companies in the NASDAQ Biotechnology Index (NBI) (the “Peer Group”), with the number of Earned TSR PSUs equal to the number of TSR 
PSUs subject to the Award multiplied by the applicable percentage set forth in the following table:
 
Level of Performance
TSR Percentile
Earned TSR PSUs
Threshold
25
25%
Target
50
100%
Stretch
75  
150%
Maximum
90  
200%
(1)	 TSR Percentile is calculated based on the Company’s ranking within the Peer Group based on its Total Stockholder Return as compared to the Total 
Stockholder Return of each member of the Peer Group.
(2)	 For performance between threshold and target, between target and stretch and between stretch and maximum, the percentage of the TSR PSUs that 
become Earned TSR PSUs will be determined on a straight-line interpolated basis.
“Total Stockholder Return” of the Company and of each member of the Peer Group shall be determined pursuant to the following formula:
Total Stockholder Return = (Final Stock Price - Initial Stock Price) + Reinvested Dividends
Initial Stock Price
For purposes of this formula, (a) “Final Stock Price” shall be the relevant company’s average closing stock price for the two-month period preceding the last 
trading day of the TSR Performance Period, (b) “Initial Stock Price” shall be the relevant company’s average closing stock price for the two-month period 
preceding the first trading day of the Performance Period, and (c) “Reinvested Dividends” shall be the aggregate number of shares (including fractional 
shares) that could have been purchased during the TSR Performance Period had each cash dividend paid on a single share during that period been 
immediately reinvested in additional shares (or fractional shares) at the closing stock price on the applicable dividend payment date. Each of the foregoing 
amounts shall be equitably adjusted for stock splits, stock dividends, recapitalizations and other similar events affecting the shares in question without the 
issuer’s receipt of consideration. 
(1)
(2)
th
th
th
th

 
 Appendix C to Performance Stock Unit Agreement
APPENDIX C
The performance metric applicable to the Strategic PSUs shall be based on the number of strategic goals (as listed below) achieved over the TSR and Strategic 
Performance Period, with the number of Earned Strategic PSUs equal to the number of Strategic PSUs subject to the Award multipled by the applicable 
percentage set forth in the following table:
Strategic Goals
1.
[***]
2.
[***] 
3.
[***]
4.
[***]
5.
[***]
 
Level of Performance
Number of Strategic Goals 
Achieved 
Earned Revenue PSUs
Threshold
2 out of 5
50%
Target
3 out of 5
100%
Stretch
4 out of 5
150%
Maximum 
5 out of 5
200%
 

 
 
 
1
Exhibit 10.77
Addendum #7 To The Lease Dated on or about July 1, 2011 By and Between 
Condiotti Enterprises, Inc. ("Lessor") And Ultragenyx Pharmaceutical Inc. 
("Lessee")
 
On or about July 1, 2011 Lessor and Lessee entered into a lease and Addendum 1 for approximately 19,916 square feet, comprising 
the entire second floor of the Premises located at 60 Leveroni Court, Novato, California. Subsequent to the execution of that Lease, 
the parties have executed Addenda two through six (together, the "Lease"), which, in addition to such other terms and conditions 
agreed to facilitate operation of the Lease and the subject changes, have extended the term of the Lease to December 31, 2024 and 
expanded the space to include all of the Premises at 60 Leveroni Court (approximately 43,517 sf) and all of the Premises at 52 
Leveroni Court (approximately 20,343 sf) and the first floor of the Premises located at 68 Leveroni Court (approximately 10,408 sf), 
bringing the total square footage subject to the Lease and Addenda to approximately 74,268 square feet.
Now, therefore, the parties do wish to amend the Lease further as follows:
112. The parties agree to extend the Term of the Lease to expire on December 31, 2026.
113.Upon execution of this Addendum #7, Tenant will vacate and surrender the Premises at 68 Leveroni Court and terminate its 
obligations under the Lease with respect to 68 Leveroni Court. Tenant shall ensure that upon execution of this Addendum, it will 
surrender of the Premises at 68 Leveroni Court to Landlord as required; specifically broom clean condition, removal of cabling, 
removal of telephone and internet wiring, removal of security equipment and wiring and removal of all personal property.
114.Tenant acknowledges and agrees that it accepts the retained Premises at 52 Leveroni Court and 60 Leveroni Court “AS-IS,” 
subject to the water leaks and HVAC units as notified by Tenant to Landlord in emails dated January 26, 2024, July 3, 2024, and July 
31, 2024.
115.Base Monthly Rent for the remaining Premises at 52 and 60 Leveroni Court (approx. 63,860 sf) for the period January 1, 2025 
through December 31, 2025 shall be at $102,176.00, and for the period of January 1, 2026 through December 31, 2026 shall be at 
$105,369.00.
116. Section 110 of Addendum 6 is hereby deleted.
117.Upon the expiration or early termination of the Lease, Tenant shall return the 52 and 60 Leveroni Court spaces in broom 
clean condition, with the removal of cabling, removal of telephone and internet wiring, removal of security equipment and 
wiring, and removal of personal property.
118.Once the space at 68 Leveroni Court has been vacated by the Tenant, Section 45 of Addendum 1 shall be amended to include a 
Letter of Credit in the amount of $105,369.00 which shall remain in effect until both spaces at 52 and 60 Leveroni Court have been 
vacated by the Tenant. All other provisions of Section 45 of Addendum 1 shall remain in full force and effect.
119.Each party to this Addendum #7 represents and agrees that commissions or fees of any kind incurred in relation to or as a 
result of this Addendum #7 shall be borne by the party incurring it.
120. Except as expressly modified by this Addendum #7 the Lease shall remain in full force and effect.

 
 
 
2
Agreed to this 22nd day of November, 2024. 
Lessee
Approved and Executed By:
 
/s/ Emil Kakkis
 
 
Name: Title:
Emil Kakkis
 
Chief Executive Officer
 
Ultragenyx Pharmaceutical Inc.
 
Lessor
 
 
  /s/ Jan Warz
 
Jan Warz, COO
Condiotti Enterprises, Inc.
 
 
 

 
 
 
 
Exhibit 10.84
 
 
FIFTH AMENDMENT TO LEASE AGREEMENT
 
THIS FIFTH AMENDMENT TO LEASE AGREEMENT (this “Fifth Amendment”) is made as of this 25th day of November, 2024, between ARE-MA 
REGION NO. 20, LLC, a Delaware limited liability company (“Landlord”), and ULTRAGENYX PHARMACEUTICAL INC., a Delaware corporation (“Tenant”).
 
RECITALS:
 
A.Tenant and Landlord are parties to that certain Lease Agreement dated as of October 30, 2015, as amended by that certain First 
Amendment to Lease Agreement dated as of March 20, 2018, as further amended by that certain Second Amendment to Lease Agreement dated as of 
July 1, 2018, as further amended by that certain Third Amendment to Lease Agreement dated as of July 29, 2019 (the “Third Amendment”), and as 
further amended by that certain Amended and Restated Fourth Amendment to Lease Agreement dated as of August 4, 2020 (the “Amended and 
Restated Fourth Amendment”) (as amended, the “Lease”). Pursuant to the Lease, Tenant leases from Landlord a total of approximately 40,060 rentable 
square feet of space consisting of (i) approximately 17,475 rentable square feet of laboratory/office space on the second floor of the Building, (ii) 
approximately 108 rentable square feet of storage space on the first floor of the Building, (iii) approximately 6,455 rentable square feet of 
laboratory/office space on the third floor of the Building, (iv) approximately 7,957 rentable square feet of laboratory/office space on the third floor of 
the Building commonly known as Suite 302, (v) approximately 130 rentable square feet of storage space on the first floor of the Building commonly 
known as Suite 100I,
(vi) approximately 7,805 rentable square feet of space on the third floor of the Building commonly known as Suite 306, and (vii) approximately 130 
rentable square feet of storage space on the first floor of the Building commonly known as Suite 100H, (collectively, the “Premises”) in that certain 
building located at 19 Presidential Way, Woburn, Massachusetts (the “Building”), as more particularly described in the Lease. Capitalized terms used 
herein without definition shall have the meanings defined for such terms in the Lease.
 
B.
The term of the Lease is scheduled to expire on April 30, 2025.
 
C.Landlord and Tenant desire, subject to the terms and conditions set forth herein below, to amend the Lease to, among other things, 
extend the term of the Lease through April 30, 2028 (the “Fifth Amendment Expiration Date”).
 
NOW, THEREFORE, in consideration of the mutual covenants herein expressed and for other good and valuable consideration, the receipt and 
sufficiency of which are hereby acknowledged, Tenant and Landlord agree as follows:
 
1.
Extension of Term. The Term of the Lease is hereby extended through the Fifth Amendment Expiration Date. Tenant’s occupancy of the Premises 
through the Fifth Amendment Expiration Date shall be on an “as-is” basis, and Landlord shall have no obligation to provide any tenant improvement 
allowance or to make any alterations to the Premises, except as set forth in Section 3.
 
2.
Base Rent. Tenant shall continue to pay Base Rent as set forth in the Lease through April 30, 2025. Commencing on May 1, 2025, Tenant shall pay 
Base Rent in the amount of $55.00 per rentable square foot of the Premises per year. On May 1, 2026, and on each May 1st thereafter (each, an 
"Adjustment Date"), the Base Rent shall be increased by multiplying the Base Rent immediately before such Adjustment Date by 3% and adding the 
resulting amount to the Base Rent payable immediately before such Adjustment Date.
 
Notwithstanding anything to the contrary contained in this Section 2, so long as Tenant is not in default under the Lease (beyond all 
applicable notice and cure periods), Base Rent shall be abated during the period commencing on May 1, 2025, through August 31, 2025 (the "Fifth 
Amendment Abatement Period"). Tenant shall resume paying full Base Rent on the first day following the expiration of the Fifth

 
 
 
 
 
2
Amendment Abatement Period. For the avoidance of doubt, Tenant shall continue paying Operating Expenses and all other amounts payable under the 
Lease during the Fifth Amendment Abatement Period.
 
3.
Premises Improvements. Landlord shall make available to Tenant a tenant improvement allowance in the amount of $5.00 per rentable square 
foot of the Premises (the “Fifth Amendment Improvement Allowance”) for the design and construction of fixed and permanent improvements desired 
by and performed by Tenant and reasonably acceptable to Landlord in the Premises (the “Premises Improvements”), which Premises Improvements 
shall be constructed pursuant to a scope of work reasonably acceptable to Landlord and Tenant. The Fifth Amendment Improvement Allowance shall be 
available only for the design and construction of the Premises Improvements. The Fifth Amendment Improvement Allowance may not be used to 
purchase any furniture, personal property, data/cabling or other non-Building System materials or equipment. Tenant acknowledges that upon the 
expiration or earlier termination of the Term of the Lease, the Premises Improvements shall become the property of Landlord and may not be removed 
by Tenant. Tenant shall pay to Landlord administrative rent in the amount of 1% of the total costs of the Premises Improvements, which amount shall 
be payable out of the Fifth Amendment Improvement Allowance. Except for the Fifth Amendment Improvement Allowance, Tenant shall be solely 
responsible for all of the costs of the Premises Improvements. The Premises Improvements shall be treated as Alterations and shall be undertaken 
pursuant to Section 12 of the Lease. The contractor for the Premises Improvements shall be selected and engaged by Tenant, subject to Landlord’s 
approval, which approval shall not be unreasonably withheld, conditioned or delayed. Prior to the commencement of the Premises Improvements, 
Tenant shall deliver to Landlord a copy of any contract with Tenant’s contractors, and certificates of insurance from any contractor performing any part 
of the Premises Improvements evidencing industry standard commercial general liability, automotive liability, “builder’s risk”, and workers’ 
compensation insurance. Tenant shall cause the general contractor to provide a certificate of insurance naming Landlord, Alexandria Real Estate 
Equities, Inc., and Landlord’s lender (if any) as additional insureds for the general contractor’s liability coverages required above.
 
During the course of design and construction of the Premises Improvements, Landlord shall reimburse Tenant for the cost of the Premises 
Improvements once a month against a draw request in Landlord’s standard form, containing evidence of payment of the applicable costs and such 
certifications, lien waivers (including a conditional lien release for each progress payment and unconditional lien releases for the prior month’s progress 
payments), inspection reports and other matters as Landlord customarily and reasonably obtains, to the extent of Landlord’s approval thereof for
payment, no later than 30 days following receipt of such draw request. Upon completion of the Premises Improvements (and prior to any final 
disbursement of the Fifth Amendment Improvement Allowance) Tenant shall deliver to Landlord the following items: (i) sworn statements setting forth 
the names of all contractors and subcontractors who did work on the Premises Improvements and final lien waivers from all such contractors and 
subcontractors; and (ii) “as built” plans, if available, for Premises Improvements. Notwithstanding the foregoing, if the cost of the Premises 
Improvements exceeds the Fifth Amendment Improvement Allowance, Tenant shall be required to pay such excess in full prior to Landlord having any 
obligation to fund any remaining portion of the Fifth Amendment Improvement Allowance. The Fifth Amendment Improvement Allowance shall only be 
available for use by Tenant for the construction of the Premises Improvements from the date of this Fifth Amendment through the date that is 12 
months after the date of this Fifth Amendment (the “Outside Fifth Amendment Improvement Allowance Date”). Any portion of the Fifth Amendment 
Improvement Allowance which has not been properly requested by Tenant from Landlord on or before the Outside Fifth Amendment Improvement 
Allowance Date shall be forfeited and shall not be available for use by Tenant.
 
4.
Right to Extend Term. Section 39(a) of the Lease is hereby deleted in its entirety and replaced with the following:
 
(a)
Extension Rights. Tenant shall have 1 right (“Extension Right”) to extend the term of the Lease for 3 years (the “Extension Term”) 
on the same terms and conditions as the Lease, as amended (other than with respect to Base Rent, the Work Letter and any TI 
Allowance) by giving Landlord written notice of its election to exercise the Extension Right at least 9 months prior, and no earlier 
than 12 months prior, to the expiration of the Fifth Amendment Expiration Date. Upon the commencement of the Extension Term, 
Base Rent

 
 
 
 
 
3
shall be payable at the Market Rate (as defined below). Base Rent shall thereafter be adjusted on each annual anniversary of the 
commencement of such Extension Term by a percentage as determined by Landlord and agreed to by Tenant at the time the 
Market Rate is determined. As used herein, “Market Rate” shall mean the rate that comparable landlords of comparable buildings 
have accepted in current transactions from non-equity (i.e., not being offered equity in the buildings) and nonaffiliated tenants of 
similar financial strength for space of comparable size, quality (including all Tenant Improvements, Alterations and other 
improvements) in laboratory/office buildings in the Route 128 N Marketplace submarket area for a comparable term, with the 
determination of the Market Rate to take into account all relevant factors, including tenant inducements, parking costs, leasing 
commissions, allowances or concessions, if any. Notwithstanding the foregoing, the Market Rate shall in no event be less than the 
Base Rent payable as of the date immediately preceding the commencement of such Extension Term.
 
If, on or before the date which is 180 days prior to the Fifth Amendment Expiration Date, Tenant has not agreed with Landlord’s 
determination of the Market Rate and the rent escalations during the Extension Term after negotiating in good faith, Tenant shall 
be deemed to have elected arbitration as described in Section 4(b). Tenant acknowledges and agrees that, if Tenant has elected to 
exercise the Extension Right by delivering notice to Landlord as required in this Section 4(a), Tenant shall have no right thereafter 
to rescind or elect not to extend the term of the Lease for the Extension Term.
 
5.
Right to Expand. For the avoidance of doubt, Tenant shall continue to have a right to expand the Premises pursuant to the terms of Section 8 of 
the Amended & Restated Fourth Amendment.
 
6.
Shared Space Arrangement. The following new subsection (g) is added to Section 22 of the Lease:
 
“(g)  Shared Space Arrangement. Notwithstanding anything to the contrary contained in the Lease, Tenant may from time to time enter into 
agreements (each, a “Shared Space Arrangement”) with affiliates of Tenant (each, a “Shared Space Occupant”), pursuant to which such 
Shared Space Occupants may collectively occupy up to 15% of the Premises as “Shared Space Area” in the aggregate for a period not to 
exceed 12 months in the aggregate, and such Shared Space Arrangements shall not require Landlord’s consent under Section 22; provided, 
however, that Tenant shall be required to provide Landlord with a copy of each such Shared Space Arrangement and, prior to the effective 
date of each such Shared Space Arrangement, Tenant and each Shared Space Occupant shall be required to execute an acknowledgment in 
the form of Exhibit A attached hereto. Tenant shall be fully responsible for the conduct of any Shared Space Occupant within the Shared 
Space Area and the Project, and Tenant’s indemnification obligations set forth in the Lease shall apply with respect to the conduct of such 
parties within the Shared Space Area and Project. Tenant shall not be required to pay any Excess Rents with respect to any Shared Space 
Arrangements to Landlord. The rights with respect to a Shared Space Arrangement as provided for in this Section 6 is personal solely to 
Ultragenyx Pharmaceutical Inc. and may not be assigned or transferred to any other person or entity. Except as modified by this Section 
22(g), all other terms of Section 22 shall remain in full force and effect.”
 
7.
Lower Level Premises. For the avoidance of doubt, the terms of the Third Amendment shall continue to apply with respect to the Lower Level 
Premises.
 
8.
OFAC. Tenant and Landlord are currently (a) in compliance with and shall at all times during the Term of the Lease remain in compliance with the 
regulations of the Office of Foreign Assets Control (“OFAC”) of the U.S. Department of Treasury and any statute, executive order, or regulation relating 
thereto (collectively, the “OFAC Rules”), (b) not listed on, and shall not during Term of the Lease be listed on, the Specially Designated Nationals and 
Blocked Persons List, Foreign Sanctions Evaders List, or the Sectoral Sanctions Identification List, which are all maintained by OFAC and/or on any other 
similar list maintained by OFAC or other governmental authority pursuant to any authorizing statute, executive order, or regulation,

 
 
 
 
 
4
and (c) not a person or entity with whom a U.S. person is prohibited from conducting business under the OFAC Rules.
 
9.
Brokers. Landlord and Tenant each represents and warrants that it has not dealt with any broker, agent or other person (collectively, “Broker”) in 
connection with the transaction reflected in this Fifth Amendment and that no Broker brought about this transaction, other than Newmark and CBRE. 
Landlord and Tenant each hereby agree to indemnify and hold the other harmless from and against any claims by any Broker, other than Newmark and 
CBRE, claiming a commission or other form of compensation by virtue of having dealt with Landlord or Tenant, as applicable, with regard to this Fifth 
Amendment.
 
10.
Miscellaneous.
 
(a)This Fifth Amendment is the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior and 
contemporaneous oral and written agreements and discussions. This Fifth Amendment may be amended only by an agreement in writing, 
signed by the parties hereto.
 
(b)This Fifth Amendment is binding upon and shall inure to the benefit of the parties hereto, and their respective successors and assigns.
 
(c)This Fifth Amendment may be executed in 2 or more counterparts, each of which shall be deemed an original, but all of which together 
shall constitute one and the same instrument. Counterparts may be delivered via facsimile, electronic mail (including pdf or any electronic 
signature process complying with the U.S. federal ESIGN Act of 2000) or other transmission method and any counterpart so delivered shall be 
deemed to have been duly and validly delivered and be valid and effective for all purposes. Electronic signatures shall be deemed original 
signatures for purposes of this Fifth Amendment and all matters related thereto, with such electronic signatures having the same legal effect 
as original signatures.
 
(d)Except as amended and/or modified by this Fifth Amendment, the Lease is hereby ratified and confirmed and all other terms of the Lease 
shall remain in full force and effect, unaltered and unchanged by this Fifth Amendment. In the event of any conflict between the provisions of 
this Fifth Amendment and the provisions of the Lease, the provisions of this Fifth Amendment shall prevail. Whether or not specifically 
amended by this Fifth Amendment, all of the terms and provisions of the Lease are hereby amended to the extent necessary to give effect to
the purpose and intent of this Fifth Amendment.
 
(e)Tenant acknowledges that Landlord’s business operations are proprietary to Landlord. Absent prior written consent from Landlord, Tenant 
shall hold confidential and will not disclose to third parties, and shall require Tenant’s assignees, sublessees, licensees, agents, servants, 
employees, invitees and contractors (or any of Tenant’s assignees, sublessees and/or licensees respective agents, servants, employees, 
invitees and contractors) to hold confidential and not disclose to third parties, information regarding the systems, controls, equipment, 
programming, vendors, tenants, and specialized amenities of Landlord.
 
[Signatures are on the next page]

 
 
 
 
 
6
IN WITNESS WHEREOF, the parties have caused their duly authorized representatives to execute this Fifth Amendment as of the date first 
written above.
 
TENANT: 
 
ULTRAGENYX PHARMACEUTICAL INC.
a Delaware corporation
 
Approved and Executed by: /s/ Emil Kakkis
Name: Emil Kakkis
Its: CEO
Date: November 20, 2024
I hereby certify that the signature, name and title above are my signature, name and title
 
 
 
LANDLORD: 
 
ARE-MA REGION NO. 20, LLC
A Delaware limited liability company 
 
By: ALEXANDRIA REAL ESTATE EQUITIES, L.P.,
a Delaware limited partnership, 
managing member
 
By: ARE-QRS CORP, 
a Maryland corporation, general partner
 
By: /s/ Scott A. Sherwood
Name: Scott A. Sherwood
Its: Real Estate Legal Affairs
Date: November 25, 2024

 
 
 
 
 
7
 
EXHIBIT A
 
FORM OF SHARED SPACE ACKNOWLEDGMENT
 
This Shared Space Acknowledgment (this “Acknowledgment”) is made as of 	
  , 20  , by and among ARE-MA REGION NO. 20, LLC, a 
Delaware limited liability company (“Landlord”), and  ULTRAGENYX  PHARMACEUTICAL  INC.,  a  Delaware  corporation  (“Tenant”),  and
	
	
, 	
 	
 (“Shared Space Occupant”), with reference to the following Recitals.
 
R E C I T A L S
 
A.
Landlord and Tenant are now parties to that certain Lease Agreement dated
	
, 2024 (as the same may in the future be amended, the “Lease”) wherein Tenant leases certain premises consisting of approximately [	
] rentable 
square feet (the “Premises”) in the building located at 19 Presidential Way, Woburn, Massachusetts. All initially capitalized terms not otherwise defined 
in this Acknowledgment shall have the meanings set forth in the Lease unless the context clearly indicates otherwise.
 
B.Tenant desires to permit Shared Space Occupant to use and occupy a portion of the Premises, as more particularly described in and 
pursuant to the provisions of that certain [Agreement] dated as of 	
	
, 20  (the “Shared Space Agreement”), a copy of which is attached hereto as 
Schedule 1.
 
NOW, THEREFORE, in consideration of the foregoing and the agreements contained herein, and for other good and valuable consideration, 
the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:
 
1.Tenant and Shared Space Occupant each represent and warrant to Landlord that the copy of the Shared Space Agreement attached hereto 
as Exhibit A is true, correct and complete.
 
2.The terms of the Shared Space Agreement are subject and subordinate to the terms of the Lease. Landlord shall have no obligations to 
Shared Space Occupant or any party claiming by or through Shared Space Occupant.
 
3.If the Lease terminates, then the Shared Space Agreement shall automatically terminate concurrently therewith.
 
4.All waivers and releases set forth in the Lease that apply as between Landlord and Tenant thereunder shall also apply as between Landlord 
and Shared Space Occupant.
 
5.Tenant shall deliver to Landlord a certificate of insurance from Shared Space Occupant, as insured, evidencing no less than the insurance 
requirements set forth in Section 17 of the Lease concurrent with Tenant’s delivery to Landlord of a fully executed copy of this Acknowledgment and 
prior to the expiration of such policy.
 
6.Tenant hereby indemnifies and agrees to hold Landlord harmless from and against any loss or liability arising from any commissions or fees 
payable in connection with the Shared Space Agreement.
 
7.Notwithstanding anything in the Shared Space Agreement to the contrary, Landlord and Shared Space Occupant each hereby release the 
other, and waive their respective rights of recovery against the other for direct or consequential loss or damage arising out of or incident to the perils 
covered by property insurance carried by such party to the extent of such insurance and waive any right of subrogation which might otherwise exist in 
or accrue to any person on account thereof.
8.Tenant and Shared Space Occupant agree that upon any conflict between the terms of the Shared 

 
 
 
 
 
8
Space Agreement and this Acknowledgment, the terms of this Acknowledgment shall control.

 
 
 
 
 
9
 
9.This Acknowledgment and the legal relations between the parties hereto shall be governed by and construed and enforced in accordance 
with the internal laws of Commonwealth of Massachusetts, without regard to its principles of conflicts of law.
 
10.Tenant and Shared Space Occupant are currently (a) in compliance with (and are required to at all times during the term of the Shared 
Space Agreement to remain) in compliance with the regulations of the Office of Foreign Assets Control (“OFAC”) of the U.S. Department of Treasury and 
any statute, executive order, or regulation relating thereto (collectively, the “OFAC Rules”), (b) not listed on, and shall not during the term of the Shared 
Space Agreement be listed on, the Specially Designated Nationals and Blocked Persons List, Foreign Sanctions Evaders List, or the Sectoral Sanctions 
Identification List, which are all maintained by OFAC and/or on any other similar list maintained by OFAC or other governmental authority pursuant to 
any authorizing statute, executive order, or regulation, and (c) not a person or entity with whom a U.S. person is prohibited from conducting business 
under the OFAC Rules.
 
11.This Acknowledgment may be executed in 2 or more counterparts, each of which shall be deemed an original, but all of which together 
shall constitute one and the same instrument. Counterparts may be delivered via facsimile, electronic mail (including pdf or any electronic signature 
process complying with the U.S. federal ESIGN Act of 2000) or other transmission method and any counterpart so delivered shall be deemed to have 
been duly and validly delivered and be valid and effective for all purposes. Electronic signatures shall be deemed original signatures for purposes of this 
Acknowledgment and all matters related thereto, with such electronic signatures having the same legal effect as original signatures
 
[ Signatures on next page ]

 
 
 
 
 
10
IN WITNESS WHEREOF, Tenant and Shared Space Occupant have caused their duly authorized representatives to execute this 
Acknowledgment as of the date first above written.
 
TENANT:
 
ULTRAGENYX PHARMACEUTICAL INC.,
a Delaware corporation
 
 
By:	  Name:	  Its:	
 
□ I hereby certify that the signature, name, and title
above are my signature, name and title.
 
 
 
SHARED SPACE OCCUPANT:
 
	
	
, a 	
 
 
By:	  Name: 	  Its: 	 
 
□  I  hereby  certify  that  the  signature,  name,  and  title
above are my signature, name and title.
 
LANDLORD:
 
ARE-MA REGION NO. 20, LLC,
a Delaware limited liability company
 
By:	 ALEXANDRIA REAL ESTATE EQUITIES, L.P.,
a Delaware limited partnership, managing member
 
By:	 ARE-QRS CORP.,
a Maryland corporation, general partner
 
 
By:	  Name:	  Its

 
 
Exhibit 10.89
FOURTH AMENDMENT TO LEASE
THIS FOURTH AMENDMENT TO LEASE (this “Fourth Amendment”) is made as of December 13, 2024 (the “Fourth 
Amendment Effective Date”), by and between GI ETS SHORELINE LLC, a Delaware limited liability company (“Landlord”), 
and ULTRAGENYX PHARMACEUTICAL INC., a Delaware corporation (“Tenant”).
WHEREAS, Landlord (as successor-in-interest to ARE-San Francisco No. 17, LLC) and Tenant are parties to that 
certain Lease Agreement dated as of December 15, 2019 (the “Original Lease”), as amended by that certain First 
Amendment to Lease Agreement dated as of September 30, 2020 (the “First Amendment”), Second Amendment to Lease 
Agreement as of October 21, 2020 (the “Second Amendment”), and Third Amendment to Lease Agreement dated as of 
July 27, 2022 (the “Third Amendment”; and, together with the Original Lease, First Amendment, Second Amendment, and 
Third Amendment, collectively, the “Lease”), demising approximately 32,377 rentable square feet (the “Premises”) in the 
building located at 7000 Shoreline Court, South San Francisco, California (the “Building”);
WHEREAS, the Base Term of the Lease currently expires on March 31, 2025 (the “Current Expiration Date”) and 
Tenant has requested that Landlord, among other things, extend the Base Term; and
WHEREAS, Landlord and Tenant desire, subject to the terms and conditions set forth below, to amend the Lease 
as set forth in this Fourth Amendment.
NOW, THEREFORE, in consideration of the mutual covenants contained herein and other good and valuable 
consideration, the receipt and sufficiency of which is hereby acknowledged, Landlord and Tenant do hereby agree as 
follows:
1.Definitions. Unless the context otherwise requires, any capitalized or defined term used herein shall have its 
respective meaning as set forth in the Lease.
2.
Term.
(a) Base Term. The Base Term is extended to expire on April 30, 2027 (the “New Expiration Date”).
(b) Extension Term.
(i)Clause (a) of Section 40 of the Lease is hereby deleted in its entirety and replaced with the 
following:
“(a) Extension Right. Tenant shall have one (1) right (the “Extension Right”) to extend 
the term of this Lease for 36 months (the “Extension Term”) on the same terms and conditions as this 
Lease (other than with respect to Base Rent and the Work Letter) by giving Landlord written notice (the 
“Exercise Notice”) of its election to exercise the Extension Right at least nine (9) months, but not more 
than fifteen (15) months, prior to the expiration of the current Term of the Lease (the “Exercise Date”). 
Notwithstanding the foregoing, Tenant shall have the right to extend the Term by giving written notice to 
Landlord of its election to extend less than nine (9) months prior to the expiration of the current Term,

 
 
 
provided that Tenant’s notice is accompanied by a payment of (a) one (1) month’s Full Service Gross Rent 
(as hereinafter defined) for each full calendar month that the written notice is delayed, and (b) a 
prorated daily amount of one (1) month’s Full Service Gross Rent for each partial calendar month that 
the written notice is delayed. For the avoidance of doubt, should Tenant provide Landlord with three (3) 
months’ prior written notice of its election to extend the Term, such notice must be accompanied by 
Tenant’s payment of six (6) months’ Full Service Gross Rent. “Full Service Gross Rent” shall mean Base 
Rent plus Tenant’s Share of (i) Utilities, (ii) Operating Expenses and (iii) Landlord’s insurance policies 
covering the Project.
 
Upon the commencement of the Extension Term, Base Rent shall be payable at the Market Rate (as defined below). Base 
Rent shall thereafter be adjusted on each annual anniversary of the commencement of such Extension Term by a 
percentage as determined by Landlord and agreed to by Tenant at the time the Market Rate is determined. As used 
herein, “Market Rate” shall mean the rate that comparable landlords of comparable buildings have accepted in current 
transactions from non-equity (i.e., not being offered equity in the buildings) and nonaffiliated tenants of similar financial
strength for space of comparable size, quality (including all Tenant Improvements, Alterations and other improvements) 
and floor height in Class A laboratory/office buildings in South San Francisco for a comparable term, with the 
determination of the Market Rate to take into account all relevant factors, including tenant inducements (including,
without limitation, rent abatements and tenant improvement allowances), available amenities (parking costs, leasing 
commissions, allowances or concessions, if any). Tenant shall exercise the Extension Right, if at all, as follows (i) Landlord 
shall deliver written notice (the “Option Rent Notice”) to Tenant within thirty (30) days after Landlord’s receipt of 
Tenant’s Exercise Notice setting forth Landlord’s good faith determination of the Market Rate, and (ii) Tenant may object, 
in a writing delivered to Landlord within ten (10) days after Tenant’s receipt of the Option Rent Notice (the “Objection 
Notice”), to Landlord’s determination of the Market Rate set forth in the Option Rent Notice, in which event such Market 
Rate shall be determined by arbitration pursuant to Section 40(b) below. If Tenant does not deliver an Objection Notice 
pursuant to the immediately preceding sentence, Tenant shall be deemed to have accepted the Market Rate set forth in 
the Option Rent Notice. Tenant acknowledges and agrees that, if Tenant has delivered an Exercise Notice to Landlord 
pursuant to this Section 40(a), Tenant shall have no right thereafter to rescind such Exercise Notice or elect not to extend 
the term of the Lease for the Extension Term. For the avoidance of doubt, the Extension Right under this Section 40(a) is 
not personal to Tenant.”
(ii)Clause (c) of Section 40 of the Lease is hereby deleted in its entirety.
(c) Term. The definition of “Term” set forth in the Original Lease shall be deleted in its entirety and 
replaced with the following:
““Term” shall mean the Base Term (as extended by this Fourth Amendment to expire on the New Expiration 
Date), as the same may be extended pursuant to Section 2 of this Fourth Amendment, unless sooner terminated 
as provided in the Lease (as amended by this Fourth Amendment).”

 
 
 
3.Base Rent. Tenant shall continue to pay Base Rent as provided for in the Lease until the Current Expiration Date 
with respect to the Premises. For the period commencing on the day following the Current Expiration Date through the 
New Expiration Date, Tenant shall pay Base Rent as follows with respect to the Premises:
 
 
Monthly Base Rent Amount
April 1, 2025 – March 31, 2026
$63,715.71 (Note: During this period, Base Rent is owed 
only for the first floor space consisting of 10,781 square 
feet)
April 1, 2026 – March 31, 2027
$197,088.51
April 1, 2027 – April 30, 2027
$203,001.17
Notwithstanding the foregoing, Base Rent shall be abated for the month of April 2025.
Base Rent and all other Rent shall be due and payable as provided under the Lease. For the avoidance of doubt, 
Tenant shall be responsible for the payment in full of Tenant’s Share of Operating Expenses for the period commencing on 
the day following the Current Expiration Date through the New Expiration Date.
4.Permitted Use. The Permitted Use as set forth in the basic lease provisions on Page 1 of the Lease is restated as 
follows:
“Permitted Use: General administrative and sales office purposes, life science discovery and 
development, preclinical research, clinical research, QC testing, pilot plant operations, and other 
manufacturing 
support 
functions, 
engineering, 
laboratory, 
partnership/special 
purpose 
vehicle/university/hospital collaboration, sales and marketing, employee training, storage and/or 
warehouse and other lawful ancillary uses that are consistent with first class life science/R&D/office 
facilities in the Greater San Francisco area, and not conducted by a government, local, state or federal 
agency, and otherwise in compliance with the provisions of Section 7 hereof.”
 
5.Tenant Improvement Allowance. Landlord and Tenant acknowledge and agree that (i) no TI Allowance is 
available to Tenant under the Lease and (ii) no TI Allowance shall be available to Tenant in connection with this Fourth 
Amendment.
6.Taxes. Tenant acknowledges that Landlord is contesting certain Taxes pursuant to appropriate legal proceedings 
in accordance with Section 9 of the Lease (“Tax Contest”). Landlord shall, upon written request from Tenant, within two 
(2) business days, make available for Tenant’s review a copy of the tax appeal application related to the Tax Contest. In the
event that a taxing authority decreases the amount of property taxes owed by Landlord with respect to the Building for a 
period during which Tenant occupied the Premises, and at the time of the decrease, Tenant is no longer occupying the 
Premises, Tenant shall be entitled to Tenant’s pro rata share (which is the same as Tenant’s Share of Operating Expenses) 
of any refund related to Taxes that accrued while Tenant was occupying the Premises.
7.Signage. Section 38 of the Lease is deleted in its entirety and replaced with the following:

 
 
 
“Signs; Exterior Appearance. Tenant shall have the right, at Tenant’s sole cost and expense and upon receipt of 
Landlord’s prior written approval of the signage to be displayed, such approval in Lender’s reasonable discretion, to 
display signage on decorative plaques inside the main lobby of the Building. Commencing on the Fourth Amendment
Effective Date, and throughout any Extension Term, Tenant shall have the exclusive right to install, maintain, repair, 
operate, and remove, at its sole cost and expense, one (1) sign (“Tenant’s Signage”) on the uppermost façade of the 
Building (including, without limitation, back lit signage and LED signage (or comparable streaming technology) and other 
programmable electronic technology, to the extent such signage technology complies with all applicable Legal 
Requirements), provided that:
(a) Tenant obtains Landlords prior written approval of the design and color of the Tenant Signage, such approval in 
Lender’s reasonable discretion, (b) the location is reasonably agreed upon by Landlord and Tenant following Tenant’s 
delivery of a signage plan which indicates the proposed locations for Tenant’s Signage; and (c) Tenant’s Signage complies 
with all applicable laws and zoning restrictions. Tenant’s Signage may be sized, at Tenant’s discretion, to the maximum 
specifications allowed by applicable laws and zoning restrictions. Other than Tenant’s Signage, Tenant shall not, without 
the prior written consent of Landlord, which may be granted or withheld in Landlord’s sole discretion (i) attach any 
awnings, exterior lights, decorations, balloons, flags, pennants, banners, painting or other projection to any outside wall of 
the Project, (ii) use any curtains, blinds, shades or screens other than Landlord’s standard window coverings, (iii) coat or 
otherwise sunscreen the interior or exterior of any windows, (iv) place any bottles, parcels, or other articles on the 
window sills, (v) place any equipment, furniture or other items of personal property on any exterior balcony, (vi) paint, 
affix or exhibit on any part of the Premises or the Project any signs, notices, window or door lettering, placards, 
decorations, or advertising media of any type which can be viewed from the exterior of the Premises or (vii) place any 
items on the exterior of corridor walls or corridor doors, other than Landlord’s standard lettering. For purposes of 
clarification, the Fourth Amendment Effective Date timing restriction shall apply only to the actual installation of Tenant’s 
Signage; and Tenant shall be entitled to obtain Landlord’s prior written approval and/or any required permits and 
approvals prior to the Fourth Amendment Effective Date. Tenant shall not be responsible for the payment of any signage 
rent, or other form of signage fee, to Landlord for Tenant’s Signage. For the avoidance of doubt, rights under this Section 
38 are not personal to Tenant.”
8.Subordination. Section 27 of the Lease is deleted in its entirety and replaced with the following:
“Subordination. This Lease and Tenant’s interest and rights hereunder are hereby made and shall be subject and 
subordinate at all times to the lien of any Mortgage now existing or hereafter created on or against the Project or 
the Premises, and all amendments, restatements, renewals, modifications, consolidations, refinancing, 
assignments and extensions thereof, without the necessity of any further instrument or act on the part of Tenant, 
provided, however that so long as there is no Default hereunder, Tenant’s right to possession of the Premises 
pursuant to the terms of the Lease (as amended) shall not be disturbed by the Holder of any such Mortgage. 
Tenant agrees, at the election of the Holder of any such Mortgage, to attorn to any such Holder. Tenant agrees 
upon demand to execute, acknowledge and deliver such instruments, confirming such subordination, and such

 
 
 
instruments of attornment as shall be requested by any such Holder, provided any such instruments contain 
appropriate non-disturbance provisions assuring Tenant’s quiet enjoyment of the Premises as set forth in Section 
24 hereof. Following the Fourth Amendment Effective Date, Landlord shall use commercially reasonable efforts to 
deliver to Tenant a subordination, non-disturbance and attornment agreement from any the Holder of any 
Mortgage or any other superior interest holder of the Project. Notwithstanding the foregoing, any such Holder 
may at any time subordinate its Mortgage to this Lease, without Tenant’s consent, by notice in writing to Tenant, 
and thereupon this Lease shall be deemed prior to such Mortgage without regard to their respective dates of 
execution, delivery or recording and in that event such Holder shall have the same rights with respect to this 
Lease as though this Lease had been executed prior to the execution, delivery and recording of such Mortgage 
and had been assigned to such Holder. Landlord shall deliver to Tenant a copy of any default notice relating to the 
Project or the Premises received by Landlord, within thirty (30) business days of Landlord’s receipt of such default 
notice, from any Holder of any Mortgage, ground lessor or from a governmental agency. The term “Mortgage” 
whenever used in this Lease shall be deemed to include deeds of trust, security assignments and any other 
encumbrances, and any reference to the “Holder” of a Mortgage shall be deemed to include the beneficiary 
under a deed of trust.”
9.Security Deposit. The Security Deposit as set forth in the basic lease provisions on Page 1 of the Lease is 
restated as follows:
“Security Deposit: As of the Fourth Amendment Effective Date: $108,888.10. Within thirty (30) days of the 
Fourth Amendment Effective Date, the Security Deposit held by Landlord will be decreased to $54,444.05.”
10.Parking. The second sentence of Section 10 of the Lease is deleted in its entirety and replaced with the 
following:
“Tenant’s pro rata share of parking shall be equal to 3.3 parking spaces per 1,000 rentable square feet of 
the Premises.”
11.Artificial Intelligence and Corporate Spying. The following is added to the end of Section 42(c) of the Lease:
“Landlord shall not use Generative AI Technology (as hereinafter defined) in connection with the processing of 
Tenant’s financial information without obtaining Tenant’s prior written consent, such consent not to be 
unreasonably withheld, conditioned or delayed. In the event Tenant’s prior written consent is obtained, the 
technology provider must maintain human oversight and accountability over all uses of Generative AI Technology 
in connection with the processing of Tenant’s financial information, to ensure outputs are accurate and free from 
bias. For purposes of this Lease, (a) “AI Technology” means any and all machine learning, deep learning, and 
other artificial intelligence (“AI”) technologies, including statistical learning algorithms, models (including large 
language models), neural networks, and other AI tools or methodologies, all software implementations of any of 
the foregoing, and related hardware or equipment, and (b) “Generative AI Technology” means AI Technology 
that generates content.”

 
 
 
12.Restoration and Removable Installations.1 Exhibit F of the Original Lease (as amended by Exhibit D attached to 
the First Amendment) is hereby deleted and amended, restated and replaced in its entirety with the “Exhibit F” attached 
hereto as Exhibit A to this Fourth Amendment, which shall list the Removable Installations which Tenant shall be entitled 
to remove following the expiration or earlier termination of the Lease.
13.Quiet Enjoyment. Section 24 of the Lease is deleted in its entirety and replaced with the following:
“Quiet Enjoyment. So long as Tenant is not in Default under this Lease, Tenant shall, subject to the terms of this 
Lease, at all times during the Term, have peaceful and quiet enjoyment of the Premises against (i) any person 
claiming by, through or under Landlord, and (ii) any surveillance by camera within the Premises. Landlord shall use 
commercially reasonable efforts to cause any service providers engaged by Landlord that enter the Premises to 
comply with this provision. Further, Landlord agrees to reasonably cooperate with Tenant should Tenant pursue 
any reasonable request for removal of a service provider in furtherance of its right to privacy.”
14.Binding Effect; Ratification; Conflict. This Fourth Amendment shall be binding upon the parties and their 
respective successors and assigns. Except as modified by this Fourth Amendment, all of the terms and conditions of the 
Lease shall remain unmodified and in full force and effect. To the extent the terms and conditions of the Lease conflict 
with or are inconsistent with this Fourth Amendment, the terms and conditions of this Fourth Amendment shall control.
15.Authority. Tenant hereby represents and warrants that (a) Tenant is in good standing under the laws of the 
state in which the Building is located, (b) Tenant has full power and authority to enter into this Fourth Amendment and to 
perform all Tenant’s obligations under this Fourth Amendment, and (c) each person (and all of the persons if more than 
one signs) signing this Fourth Amendment on behalf of Tenant is duly and validly authorized to do so.
16.No Offer. Submission of this Fourth Amendment for examination and signature to Tenant does not constitute
an offer to amend the Lease, and this instrument is not effective as an amendment to the Lease or otherwise until 
executed and delivered by both Landlord and Tenant.
17.Brokers. Landlord and Tenant each represents and warrants to the other that they have not dealt with any 
broker in connection with this Fourth Amendment, other than Jones Lang LaSalle (as Landlord’s representative) and Kidder 
Mathews of California (“Tenant’s Representative”). Landlord and Tenant each agrees to defend, indemnify and hold the 
other harmless from and against all claims by any other broker for fees, commissions or other compensation to the extent 
such broker alleges to have been retained by the indemnifying party in connection with the execution of this Fourth 
Amendment. Landlord shall pay Tenant’s Representative in accordance with that certain Kidder – Commission Agreement, 
dated as of May 21, 2024, by and between Landlord and Tenant’s Representative.
18.Entire Agreement. This Fourth Amendment, together with the Lease, constitutes the entire agreement 
between Landlord and Tenant regarding the Lease and the subject matter
 
1 NTD: Tenant to provide proposed Exhibit A (removable installations).

 
 
 
contained herein and supersedes any and all prior and/or contemporaneous oral or written negotiations, agreement or 
understandings, except as otherwise expressly provided herein. This Fourth Amendment may not be amended or modified 
except pursuant to a written instrument executed by both Landlord and Tenant.
19.Attorneys’ Fees. Should any suit be brought to enforce or interpret the terms of this Fourth Amendment or 
any obligation herein, the prevailing party, either by way of settlement or by final judgment, shall be entitled to recover its
reasonable out-of-pocket attorneys’ fees, costs and expenses.
20.Construction. The headings used in this Fourth Amendment are for convenience and reference use only, and 
are not to be considered in the construction or interpretation of this Fourth Amendment. The parties agree that each 
party and its legal counsel has reviewed or has had the opportunity to review this Fourth Amendment and that any rule of 
construction to the effect that ambiguities are to be resolved against the drafting party shall not apply in any construction 
or interpretation of this Fourth Amendment.
21.Governing Law. This Fourth Amendment shall be construed and enforced in accordance with the laws of the 
state in which the Building is located applicable to contracts entered into in such state by parties residing therein.
22.Counterparts; Electronic Delivery. This Fourth Amendment may be executed in counterparts, each of which 
shall be deemed a part of an original and all of which together shall constitute one (1) agreement. Signature pages may be 
detached from the counterparts and attached to a single copy of this Fourth Amendment to form one (1) document. 
Furthermore, this Fourth Amendment may be executed and delivered by electronic transmission. The parties intend that 
electronic (e.g. pdf format or DocuSign) signatures constitute original signatures and that an electronic copy or 
counterparts of this Fourth Amendment containing signatures (original or electronic) of a party is binding upon that party.
23.Invalidity. If any provision of this Fourth Amendment is invalid or unenforceable under applicable law, such 
invalidity or unenforceability shall not affect the validity and enforceability of the remaining provisions of this Fourth 
Amendment.
IN WITNESS WHEREOF, Landlord and Tenant have executed this Fourth Amendment as of the day and year first 
written above.
LANDLORD:	 TENANT:
 
 

 
 
 
GI ETS SHORELINE LLC,
a Delaware limited liability company
 
 
Approved and Executed By:
 
By:	 /s David Boehle
Name: David Boehle
Title: Director
​
 

 
 
 
ULTRAGENYX PHARMACEUTICAL INC.,
a Delaware corporation
 
 
Approved and Executed By:
/s/ Emil Kakkis
Name: Emil Kakkis
Title: Chief Executive Officer

 
 
 
Exhibit 10.93
FIRST AMENDMENT TO LEASE
This First Amendment to Lease (this “Amendment”) is made and entered into as of March 12, 2024, by and 
BRICKBOTTOM I QOZB LP, a Delaware limited partnership transacting business in Massachusetts as BRICKBOTTOM I QOZB 
LIMITED PARTNERSHIP (“Landlord”), and ULTRAGENYX PHARMACEUTICAL INC., a Delaware corporation (“Tenant”).
W I T N E S S E T H:
WHEREAS, Landlord and Tenant are parties to a Lease dated August 18, 2022 (the “Lease”), whereby Tenant leases 
from Landlord certain premises (the “Premises”) in the building located at 100 Chestnut Street, Somerville, Massachusetts 
(the “Building”), as more particularly described in the Lease; and
WHEREAS, Landlord and Tenant desire to amend the Lease to provide for the performance of certain additional 
improvements by Landlord and the temporary increase in the number of parking spaces provided to Tenant, subject to and 
upon the terms and conditions hereinafter provided.
NOW, THEREFORE, in consideration of the foregoing and for other consideration the mutual receipt and sufficiency 
of which are hereby acknowledged, Landlord and Tenant agree that the Lease is hereby amended as follows:
1.Unless otherwise defined herein, all capitalized terms shall have the same meaning as they have been 
assigned in the Lease.
2.Landlord shall, not later than April 30, 2024, and at Landlord’s sole cost and expense, install a Building-
standard WiFi/LTE booster or extender at the Building.
3.The third paragraph of Section 3.3(c) of the Lease is hereby amended by inserting the following as the third 
sentence thereof:
Notwithstanding anything herein to the contrary, the hard costs of Tenant’s Work shall not include the first 
Ninety Thousand and 00/100 Dollars ($90,000.00) of the costs of Tenant’s Work in excess of the Maximum 
Turnkey Amount.
4.The second sentence of the second paragraph of Section 3.6 of the Lease is hereby deleted and in its place the 
following shall be inserted:
If the Total TI Costs exceed the Maximum Turnkey Amount, Landlord shall pay the first Ninety-Thousand 
and 00/100 Dollars ($90,000.00) of such excess and then (i) to the extent that the increase in Total TI 
Costs is attributable to a change in the scope of Tenant’s Work from that shown on or contemplated by 
the Schematic Plans or Work Matrix and/or to additional design elements, or a change to design 
elements, of Tenant’s Work beyond those shown on or contemplated by the Schematic Plans or Work 
Matrix, then such increase in 

 
 
 
the Total TI Costs (i.e., the difference per square foot of Premises Rentable Area between the Total TI 
Costs per square foot of Premises Rentable Area

 
 
 
and $324.50 per square foot of Premises Rentable Area) shall be Excess Costs (but shall not constitute a 
Tenant Delay) and shall be paid by first applying any unused amount, following the final determination 
of the costs of Tenant’s Work, of the Contingencies and then paid by Tenant; and (ii) to the extent that 
the increase in costs is not attributable to a change in the scope of Tenant’s Work from that shown on or 
contemplated by the Schematic Plans or Work Matrix and/or to additional design elements, or a change 
to design elements, of Tenant’s Work beyond those shown on or contemplated by the Schematic Plans 
or Work Matrix, then such increase in the Total TI Costs (i.e., the difference per square foot of Premises 
Rentable Area between the Total TI Costs per square foot of Premises Rentable Area and $324.50 per 
square foot of Premises Rentable Area) shall be paid by Landlord.
5.Tenant shall be entitled to a credit in the amount of Forty-Two Thousand and 00/100 Dollars ($42,000.00), 
which credit shall be applied in equal monthly installments between April 1, 2024, and December 31, 2024, in the amount 
of Four Thousand Six Hundred Sixty-Six and 67/100 Dollars ($4,666.67) per month. At Tenant’s election, such credit shall 
be applied to charges incurred by Tenant at the café located in the Building.
6.This Amendment may be executed in multiple counterparts, including by electronic signature or DocuSign, each of 
which shall constitute an original instrument but all of which shall constitute one and the same agreement.
7.
As amended hereby, the Lease is hereby ratified and confirmed.
[Signature Page to Follow]

 
 
 
IN WITNESS WHEREOF, the parties hereunto have executed this Amendment as of the date first written above.
LANDLORD: BRICKBOTTOM I QOZB LP
By: NRL Manager LLC Its general partner
By: North River Company, LLC Its Manager
By: /s/ Christopher S. Flagg
 Name: Christopher S. Flagg Title: Manager
13-March-2024
 
TENANT:
Ultragenyx Pharmaceutical Inc.
 
By: /s/ Emil Kakkis
Name: Emil Kakkis
 Title: CEO
 12-March-2024

 
 
Exhibit 19.1
Ultragenyx Pharmaceutical Inc.
 
INSIDER TRADING POLICY
Approved: March 15, 2023
 
This Insider Trading Policy (this “Policy”) applies to all employees, officers, directors and consultants of Ultragenyx 
Pharmaceutical Inc. and its subsidiaries (collectively, the “Company”) as well as your family members, household members and 
entities controlled by you (as described below).  This Policy is designed to prevent insider trading or allegations of insider 
trading, and to protect the Company’s reputation for integrity and ethical conduct.  It is your obligation to understand and 
comply with this Policy.  Should you have any questions regarding this Policy, please contact the Company’s Chief Financial 
Officer (“CFO”) or the Company’s Chief Legal Officer. 
 
BACKGROUND
 
The Company’s Board of Directors (the “Board”) has adopted this Policy for our directors, officers, employees, and consultants 
as well as their family members, household members and  entities controlled by them (as described below) with respect to the 
trading of the Company’s securities, as well as the securities of publicly traded companies with whom we have a business 
relationship.
 
Federal and state securities laws prohibit the purchase or sale of a company’s securities by persons who are aware of material 
information about that company that is not generally known or available to the public.  These laws also prohibit persons who 
are aware of such material nonpublic information from disclosing this information to others who may trade.  Companies and 
their controlling persons are also subject to liability if they fail to take reasonable steps to prevent insider trading by company 
personnel.  
 
It is important that you understand the breadth of activities that constitute illegal insider trading and the consequences for such 
activities, which can be severe.  Both the U.S. Securities and Exchange Commission (the “SEC”) and The Nasdaq Stock Market 
LLC (“Nasdaq”) investigate and are very effective at detecting insider trading.  The SEC, together with the Offices of the U.S. 
Attorneys, pursues insider trading violations vigorously.  Cases have been successfully prosecuted against trading by employees 
through foreign accounts, trading by family members and friends, and trading involving only a small number of shares.
 
PENALTIES FOR NONCOMPLIANCE WITH THIS POLICY
 

 
	
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The Law.  Federal law imposes heavy penalties on those who, in violation of law, either buy or sell securities while aware of 
material nonpublic information, or pass such material nonpublic information along to others who use it to buy or sell securities 
(known as “tipping”).
 
Civil and Criminal Penalties.  Potential penalties for insider trading violations include 
(1) imprisonment for up to 20 years, (2) criminal fines of up to $5 million, and (3) civil fines of up to three times the profit 
gained or loss avoided.
 
Controlling Person Liability.  If the Company fails to take appropriate steps to prevent illegal insider trading, the Company may 
have “controlling person” liability for a trading violation, with civil penalties of up to the greater of (1) $1.525 million, as may be 
adjusted for inflation, and (2) three times the profit gained or loss avoided, as well as a criminal penalty of up to $25 million.  
The civil penalties can extend personal liability to the Company’s directors, officers, and other supervisory personnel if they fail 
to take appropriate steps to prevent insider trading.
 
Company Sanctions.  Failure to comply with this Policy may also subject you to Company-imposed sanctions, including dismissal 
for cause, whether or not your failure to comply with this Policy results in a violation of law.
 
Any of these consequences, and even an investigation that does not result in prosecution, can tarnish the Company’s 
reputation and irreparably damage you and the Company.  
 
SCOPE OF POLICY
 
Persons Covered.  As a director, officer, employee, or consultant of the Company, this Policy applies to you.  The same 
restrictions that apply to you apply to: (1) your family members who reside with you, (2) anyone else who lives in your 
household, (3) any family members who do not live in your household but whose transactions in Company securities are 
directed by you or are subject to your influence or control (such as parents or children who consult with you before they trade 
in Company securities), (4) any corporations or other business entities controlled or managed by you, and (5) any trusts of 
which you are the trustee or otherwise have investment control over or beneficial or pecuniary interest.  You are responsible 
for making sure that the purchase or sale of any security covered by this Policy by any such person or entity complies with this 
Policy. 
 
Companies Covered.  The prohibition on insider trading in this Policy is not limited to trading in the Company’s securities.  It 
includes trading in the securities of other companies with whom we have a business relationship such as customers or suppliers 
of the Company and those with which the Company may be negotiating major transactions, such as an acquisition, investment, 
or sale.  Information that is not material to the Company may nevertheless be material to one of those other companies.
 
Transactions Generally Covered.  Trading includes acquisitions/purchases and dispositions/sales of stock, derivative securities 
(such as put and call options and convertible debentures or 

 
	
- 3 -
 
preferred stock), debt securities (debentures, bonds, and notes), and gifts of securities.  Trading also includes entering into or 
modifying a 10b5-1 Plan (as defined below) to trade securities in the future. Trading also includes certain transactions under 
Company plans, but not all of such transactions are subject to the trading restrictions under this Policy.  Specifically:
 
•
Stock Option Exercises and Restricted Stock/RSU Vesting.  This Policy’s trading restrictions generally do not apply to 
the exercise of a stock option (whether in cash or through a net exercise).  The trading restrictions do apply, 
however, to any sale of the underlying stock or to a cashless exercise of the option through a broker, as this entails 
selling a portion of the underlying stock to cover the costs of exercise.  In addition, this Policy’s restrictions do not 
apply to the withholding of shares by the Company to satisfy a tax withholding obligation upon the vesting of 
restricted stock or settlement of restricted stock units (if applicable, and to the extent permitted under the 
Company’s equity incentive plans).  However, the sale of shares, including a broker-assisted cashless exercise, to 
satisfy tax withholding obligations is subject to the restrictions set forth in this Policy. 
 
•
Employee Stock Purchase Plan.  This Policy also does not apply to your purchases of Company stock in the 
Company’s Employee Stock Purchase Plan ( the “ESPP”) resulting from your periodic contribution of money to the 
ESPP pursuant to your payroll deduction election that is made while you are permitted to trade under this Policy 
and you are not aware of material nonpublic information regarding the Company.  However, this Policy will apply 
to any:  (a) election to participate in the ESPP for an enrollment period; (b) election to increase or decrease your 
amount of periodic contributions to the ESPP; and (c) sales of Company stock purchased under the ESPP.  
 
Transaction Not Covered.  If you own shares of a mutual fund that invests in the Company’s securities, there are no restrictions 
on trading the shares of the mutual fund at any time.
 
STATEMENT OF POLICY
 
No Trading on Material Nonpublic Information.  You may not trade in the securities of the Company, directly or indirectly, 
including through family members or other persons or entities, if you are aware of any material nonpublic information relating 
to the Company.  Similarly, you may not trade, directly or indirectly, in the securities of any other company with whom we have 
a business relationship if you are aware of material nonpublic information about that company, including material nonpublic 
information that you obtained in the course of your employment with the Company.  
 
As described below, directors, certain officers and designated employees as well as their family members, household members 
and entities under their control may only trade in Company securities during specific periods each quarter.  The Company will 
notify you if you are subject to these trading restrictions.  From time to time due to certain developments relating to 

 
	
- 4 -
 
material nonpublic information, the Company may also implement special blackout periods during which the Company may 
notify all employees or particular individuals that they should not engage in any transactions involving the purchase or sale of 
Company securities or the securities of another company.  If you are subject to a special blackout period, you should not trade 
in the applicable company’s securities during such time and you should not disclose to others the fact that you are prohibited 
from trading. However, it is not the Company’s policy to impose special blackout periods every time that material nonpublic 
information exists, or every time that a Company employee may be in the possession of material nonpublic information. Thus, 
the absence of a special blackout should not be interpreted as permission to trade. 
 
In addition,  is it the Company’s policy to comply with all applicable securities laws when issuing or repurchasing its securities.
 
No Tipping.  You may not pass material nonpublic information of the Company or any other company on to others or 
recommend to anyone the purchase or sale of any securities of the Company or any such other company when you are aware 
of such information.  This practice, known as “tipping,” also violates the securities laws and can result in the same civil and 
criminal penalties that apply to insider trading, even though you did not trade and did not gain any benefit from another’s 
trading.
 
No Exception for Hardship.  The existence of a personal financial emergency does not excuse you from compliance with this 
Policy.  
 
DEFINITION OF MATERIAL NONPUBLIC INFORMATION
 
Note that material nonpublic information has two important elements: (1) materiality and (2) public availability.  
 
Material Information.  Information is material if there is a substantial likelihood that a reasonable investor would consider it 
important in deciding whether to buy, hold, or sell a security.  Any information that could reasonably be expected to affect the 
price of the security is material.  Common examples of material information are:
 
•
earnings or losses and other financial information, including projections or other earnings guidance, whether or 
not they are significantly higher or lower than generally expected by the investment community; 
•
a pending or proposed merger, acquisition, or sale of all or part of the Company’s business;
•
current, proposed or contemplated transactions, business plans, financial restructurings, acquisition targets or 
significant expansions or contractions of operations; 
•
impending securities offerings by the Company; 
•
changes in management, directors or auditors; 
•
clinical trial results;

 
	
- 5 -
 
•
significant new products or discoveries; 
•
negotiations regarding an important license, distribution agreement, or joint venture;
•
pending FDA or other regulatory action;
•
major events regarding the Company’s securities, including the declaration of a stock split, dividend or the offering 
of additional securities; 
•
impending financial problems;
•
actual or threatened major litigation, or the resolution of such litigation;
•
significant actual or potential cybersecurity incidents or events that affect the Company or third party providers 
that support the Company’s business operations, including computer system or network compromises, viruses or 
other destructive software, and data breach incidents that may disclose personal, business or other confidential 
information; 
•
new major contracts, order, suppliers, customer or finance sources, or the loss thereof; or
•
changes in the status of any of the Company’s activities which may have an adverse or favorable impact. 
 
Note that other types of information may also be material; no complete list can be given. 
 
Both positive and negative information can be material.  Because trading that receives scrutiny from federal and Nasdaq 
investigators will be evaluated after the fact with the benefit of hindsight, when in doubt, questions concerning the materiality 
of particular information should be resolved in favor of considering it material, and trading should be avoided.
 
Nonpublic Information.  Nonpublic information is information that is not generally known or available to the public.  One 
common misconception is that material information loses its “nonpublic” status as soon as a press release is issued disclosing 
the information.  In fact, information is considered to be available to the public only when it has been released broadly to the 
marketplace (such as by a press release or an SEC filing) and the investing public has had time to absorb the information fully.  
As a general rule, Company information is considered nonpublic until after the second full trading day after the information is 
released.  For example, if the Company announces financial earnings before trading begins on a Tuesday, the first time you can 
buy or sell Company securities is the opening of the market on Thursday (assuming you are not aware of other material 
nonpublic information at that time).  However, if the Company announces earnings after trading begins on that Tuesday, the 
first time you can buy or sell Company securities is the opening of the market on Friday. 
 
EXCEPTION FOR TRANSACTIONS PURSUANT TO RULE 10b5-1 PLANS
 
An exception to this rule is trading in compliance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the 
“Exchange Act”) pursuant to a contract, instruction, or written plan that (1) specifies, or includes a written formula or algorithm 
or computer program for determining, the amount, price and date of securities to be purchased or sold, (2) is 

 
	
- 6 -
 
established at a time when you were not aware of material, nonpublic information, and (3) satisfies Exchange Act Rule 10b5-
1(c) (a “10b5-1 Plan”).  Any 10b5-1 Plan is required to be reviewed and approved by the CFO and the Chief Legal Officer, or 
designees of such persons, prior to entry into such plan.  In addition, all amendments, modifications and terminations of a 
10b5-1 Plan must be reviewed and approved by the CFO and the Chief Legal Officer, or designees of such persons prior to 
effecting any such amendments, modifications or terminations.  In accordance with SEC rules, any 10b5-1 Plan must also satisfy 
the following requirements:
 
•
Timing.  A Rule 10b5-1 Plan can only be entered into, amended, modified or terminated during the Window Period (as 
defined below) and at a time when the person entering into the plan is not aware of material nonpublic information.  
 
•
Cooling-off Period.  The first scheduled transaction in an approved and executed 10b5-1 Plan must not take place until 
the end of a cooling-off period, which means (a) if you are a director or Section 16 Executive Officer (defined below), 
the later of (i) ninety (90) calendar days after the 10b5-1 Plan is entered into, and (ii) two business days following the 
disclosure of the Company’s financial results in a Form 10-K or Form 10-Q for the fiscal quarter in which the 10b5-1 
Plan was adopted (in any case, the transaction may occur after 120 calendar days after the 10b5-1 Plan is entered into), 
or (b) if you are not a director or Section 16 Executive Officer, thirty (30) calendar days after the 10b5-1 Plan is entered 
into. Amendments or modifications of a 10b5-1 Plan that impact the amount, price or timing of transactions under the 
plan will be treated as the adoption of a new plan and subject to the applicable cooling-off period described above.
 
•
Good Faith.  The 10b5-1 Plan must be entered into in good faith and not as part of a plan or scheme to evade the 
prohibitions of the securities laws, and you must act in good faith with respect to the 10b5-1 Plan.
 
•
Restrictions on Overlapping and Single-Trade Plans.  You may not enter into more than one 10b5-1 Plan for trading 
Company securities during the same period, unless the additional plan only authorizes “sell-to-cover” transactions to 
satisfy tax withholding obligations in connection with the vesting of equity awards.  In addition, you may not enter into 
more than one single-trade 10b5-1 Plan within a 12-month period.
 
Directors and Section 16 Executive Officers are subject to additional requirements when entering into 10b5-1 Plans, including 
certification requirements (regarding material non-public information and good faith) as well as disclosure requirements (e.g., 
the Company will need to disclose in its Form 10-Q or Form 10-K the material terms of your plan, other than price).
 
In accordance with SEC rules, any 10b5-1 Plan adopted prior to February 27, 2023 that is not subsequently modified or 
amended on or after February 27, 2023 in the manner described under “Cooling-off Period” above is grandfathered from 
certain of the requirements described 

 
	
- 7 -
 
in this section. Please contact the Chief Legal Officer with any questions with respect to the requirements applicable to such 
10b5-1 Plans. 
 
Other than transactions pursuant to 10b5-1 Plans, there is no exception to this Policy, including for transactions that may be 
necessary or justifiable for independent reasons (such as the need to raise money for an emergency expenditure, as noted 
above).  
 
SPECIAL RESTRICTIONS FOR DIRECTORS, SECTION 16 EXECUTIVE OFFICERS AND CERTAIN OTHER PERSONS
 
Persons Subject to Special Restrictions.  To help prevent inadvertent violations of the federal securities laws and to avoid even 
the appearance of trading on the basis of material nonpublic information, the Board has adopted certain procedures that apply 
to directors, officers subject to Section 16 of the Exchange Act (“Section 16 Executive Officers”), and certain designated 
employees and consultants of the Company and its subsidiaries who have access to material nonpublic information about the 
Company.  The Company will notify you if you (as well as your family members, household members and entities you control) 
are subject to these special trading and/or pre-clearance restrictions, described below.
 
Window Periods.  Each director, Section 16 Executive Officer, certain designated finance team members of the Company, and 
anyone else specifically designated as subject to window period restrictions may only trade in Company securities from the date 
that is two full trading days after the Company’s filing of a Form 10-Q or Form 10-K with the SEC to the end of business on the 
Monday of the second full calendar week prior to the end of each quarter (such period, the “Window Period”).
 
However, even if the Window Period is open, you (as well as your family members, household members and controlled entities) 
may not trade in Company securities if you are aware of material nonpublic information about the Company.  In addition, if you 
are subject to the Company’s pre-clearance policy, described below, you must pre-clear transactions even if you (or your family 
members, household member or controlled entity) initiate them when the Window Period is open.
 
From time to time during the Window Period, the Company may close trading due to developments (such as a significant event 
or transaction) that may involve material nonpublic information.  In such cases, the CFO and the Chief Legal Officer may notify 
particular individuals that they should not engage in any transactions in the Company’s securities, and should not disclose to 
others the fact that trading has been prohibited.
 
Even if the Window Period is closed, you may exercise stock options if no shares are to be sold.  However, you may not effect 
sales of stock issued upon the exercise of stock options (including same-day sales and cashless exercises).  Generally, all 
pending purchase and sale orders regarding Company securities that could be executed while the Window Period is open must 
be cancelled before it closes.

 
	
- 8 -
 
 
In light of these restrictions, if you anticipate the need to sell Company stock at a specific time in the future, you may wish to 
consider entering into a 10b5-1 Plan, as discussed above.
 
Pre-Clearance Procedures.  Each director, Section 16 Executive Officer, certain designated finance team members of the 
Company, if any, and anyone else specifically designated as subject to pre-clearance restrictions must contact the CFO and the 
Chief Legal Officer, or designees of such persons in advance of effecting any transaction in the Company’s securities and obtain 
his/her prior approval of the transaction.  The pre-clearance policy applies to these individuals (as well as their family members, 
household members and controlled entities) even if they are initiating a transaction while the Window Period is open.   All 
requests must be submitted at least forty-eight (48) hours prior to making any transaction (purchase or sale) involving the 
Company’s securities.  The CFO and the Chief Legal Officer, or designees of such persons will then determine whether the 
transaction may proceed.  If the transaction is approved, the transaction must be executed within five business days after 
approval is obtained, but regardless may not be executed if you acquire material nonpublic information concerning the 
Company prior to the transaction’s execution.  If a transaction is not completed within the period described above, the 
transaction must be approved again before it may be executed.  If a proposed transaction is not approved under the pre-
clearance policy, you (or your family member, household member or controlled entity) should refrain from initiating any 
transaction in Company securities, and you should not inform anyone within or outside the Company of the restriction. 
 
Section 16 Reporting.  For directors and Section 16 Executive Officers, if the Company pre-clears the transaction and you 
proceed with it, the Company will assist you in complying with your reporting obligations under Section 16 of the Exchange Act 
(“Section 16”).  Under Section 16, directors and Section 16 Executive Officers are required to a file a Form 4 within two business 
days after certain changes in beneficial ownership occur (including the exercise of options or other derivative securities and 
gifts of securities).  Form 4 requires that you provide detailed information relating to any purchase, sale, or exercise, including 
the price of the shares acquired or disposed, the transaction date, and the amount of securities beneficially owned following 
the transaction.  As such, you should promptly report the details of any transaction that you engage in to the CFO or the Chief 
Legal Officer. 
 
Rule 144.  If you are a director or Section 16 Executive Officer, you may be deemed to be an “affiliate” of the Company.  
Consequently, shares of Company common stock held by you may be considered to be “restricted securities” or “control 
securities,” the sale of which are subject to compliance with Rule 144 under the Securities Act of 1933, as amended (or any 
other applicable exemption under the federal securities laws).  If this is the case, note that Rule 144 places limits on the number 
of shares you may be able to sell and provides that certain procedures must be followed before you can sell shares of Company 
stock.  Contact the Chief Legal Officer for more information on Rule 144.   
 
ADDITIONAL GUIDANCE

 
	
- 9 -
 
 
The Company considers it improper and inappropriate for those employed by or associated with the Company to engage in 
short term or speculative transactions in the Company’s securities or in other transactions in the Company’s securities that may 
lead to inadvertent violations of the insider trading laws.  Accordingly, trading in Company securities is subject to the following 
additional guidance.  
 
Short-term Trading.  Any person or entity covered by this Policy may not sell Company securities within six months of 
purchasing Company securities. 
 
Short Sales.  Any person or entity covered by this Policy may not engage in short sales of the Company’s securities (sales of 
securities that are not then owned), including any “sales against the box” (a sale with delayed delivery).  
 
Hedging Transactions.  The Company prohibits purchasing “hedge” instruments and engaging in other hedging, offsetting and 
monetization transactions that are designed to hedge, offset or transfer, with respect to equity compensation received by a 
director, officer, or employee or other equity securities held (directly or indirectly) by a director, officer or employee, all or a 
portion of the risk of a decline in the market price of shares of Company securities.  Instruments that would be considered to be 
a “hedge” include prepaid variable forward contracts, equity swaps, collars, and exchange funds.  For the avoidance of doubt, 
10b5-1 Plans providing for future sales or purchases of securities are not prohibited by this Policy.
 
Publicly Traded Options and Other Derivative Securities.  Any person or entity covered by this Policy may not engage in 
transactions in publicly traded options on Company securities, such as puts, calls, and other derivative securities, on an 
exchange or in any other organized market.
 
Standing Orders.  Standing orders should be used only for a very brief period of time.  A standing order placed with a broker to 
sell or purchase stock at a specified price leaves you without control over the timing of the transaction.  A standing order 
transaction executed by the broker when you (or your family member, household member or controlled entity) are aware of 
material nonpublic information may result in unlawful insider trading.
 
Margin Accounts and Pledges.  Securities held in a margin account or pledged as collateral for a loan may be sold without your 
consent by the broker if you fail to meet a margin call or by the lender in foreclosure if you default on the loan.  A margin or 
foreclosure sale that occurs when an insider is aware of material nonpublic information may, under some circumstances, result 
in unlawful insider trading. Because of this danger, you are prohibited from holding Company securities in a margin account or 
pledging Company securities as collateral for a loan.  
 
POST-TERMINATION TRANSACTIONS
 
This Policy continues to apply to your transactions in Company securities even after you have terminated employment or other 
services to the Company or a subsidiary as follows:  if you are 

 
	
- 10 -
 
aware of material nonpublic information when your employment or service relationship terminates, you may not trade in 
Company securities until that information has become public or is no longer material.
 
UNAUTHORIZED DISCLOSURE
 
Maintaining the confidentiality of Company information is essential for competitive, security, and other business reasons, as 
well as to comply with securities laws.  You should treat all information you learn about the Company or its business plans in 
connection with your employment as confidential and proprietary to the Company.  Inadvertent disclosure of confidential or 
material nonpublic information may expose the Company and you to significant risk of investigation and litigation.
 
The timing and nature of the Company’s disclosure of material information to outsiders is subject to legal rules, the breach of 
which could result in substantial liability to you, the Company, and its management.  Accordingly, it is important that responses 
to inquiries about the Company by the press, investment analysts, or others in the financial community be made on the 
Company’s behalf only through authorized individuals.  If you receive inquiries of this nature, refer them to the CFO and the 
Chief Legal Officer.
 
PERSONAL RESPONSIBILITY
 
You should remember that the ultimate responsibility for adhering to this Policy and avoiding improper trading rests with you.  
If you violate this Policy, the Company may take disciplinary action, including dismissal for cause.
 
COMPANY ASSISTANCE
 
Your compliance with this Policy is of the utmost importance both for you and for the Company.  If you have any questions 
about this Policy or its application to any proposed transaction, you may obtain additional guidance from the CFO and the Chief 
Legal Officer.  Do not try to resolve uncertainties on your own, as the rules relating to insider trading are often complex, not 
always intuitive, and carry severe consequences. On an annual basis, you must certify that you have read and understood this 
Policy.  
 
 

Exhibit 21.1
 
Significant Subsidiaries of Ultragenyx Pharmaceutical Inc.
Name of Subsidiary
 
Jurisdiction of Incorporation
Ultragenyx Holdco LLC
 
Delaware
Rare Delaware Inc. 
 
Delaware
Amlogenyx Inc.
 
Delaware
Ultragenyx UK Ltd
 
United Kingdom 
Ultragenyx Europe GmbH
 
Switzerland
Ultragenyx Germany GmbH
 
Germany 
Ultragenyx Brasil Farmacêutica Ltda
 
Brazil 
Ultragenyx Argentina SRL
 
Argentina
Ultragenyx Netherlands B.V.
 
Netherlands 
Ultragenyx France SAS
 
France
Ultragenyx Colombia SAS
 
Colombia 
Ultragenyx Canada Inc.
 
Canada
Ultragenyx México, S. de R.L. de C.V.
 
Mexico 
Ultragenyx Japan K.K.
 
Japan
Ultragenyx Chile Limitada
 
Chile
 
 
 

 
 
Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
 
We consent to the incorporation by reference in the following Registration Statements:
 
(1) 	 Registration Statements (Form S-8 Nos. 333-194773, 333-201843, 333-209729, 333-216110, 333-223124, 333-229746, 333-236428, 333-253007, 333-
262751, 333-269840, 333-272518, and 333-280776) pertaining to the 2011 Equity Incentive Plan, as amended, 2014 Incentive Plan, as amended, 
2014 Employee Stock Purchase Plan, as amended and restated, 2023 Incentive Plan, as amended and restated, and Employee Inducement Plan, as 
amended of Ultragenyx Pharmaceutical Inc.,
(2)	 Registration Statement (Form S-8 No. 333-221381) pertaining to the Dimension Therapeutics, Inc. 2015 Stock Option and Incentive Plan and the 
Dimension Therapeutics, Inc. 2013 Stock Plan, both as assumed by Ultragenyx Pharmaceutical Inc., and
 
(3)	 Registration Statement (Form S-3 No. 333-277226) and related Prospectus of Ultragenyx Pharmaceutical Inc. for the registration of common stock, 
preferred stock, debt securities, warrants and units;
of our reports dated February 19, 2025, with respect to the consolidated financial statements of Ultragenyx Pharmaceutical Inc. and the effectiveness of 
internal control over financial reporting of Ultragenyx Pharmaceutical Inc. included in this Annual Report (Form 10-K) of Ultragenyx Pharmaceutical Inc. for 
the year ended December 31, 2024.
 
/s/ Ernst & Young LLP
 
San Mateo, California
February 19, 2025
 

 
 
Exhibit 31.1
CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002 
I, Emil D. Kakkis, certify that: 
1.
I have reviewed this Annual Report on Form 10-K of Ultragenyx Pharmaceutical Inc.; 
2.
Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the 
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this 
report; 
3.
Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the 
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 
4.
I am responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and 
internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: 
a)
Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to 
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those 
entities, particularly during the period in which this report is being prepared; 
b)
Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our 
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for 
external purposes in accordance with generally accepted accounting principles; 
c)
Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the 
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 
d)
Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent 
fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to 
materially affect, the registrant’s internal control over financial reporting; and 
5.
I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee 
of the registrant’s board of directors (or persons performing the equivalent functions): 
a)
All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably 
likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 
b)
Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal 
control over financial reporting. 
 
Dated: February 19, 2025
 /s/ Emil D. Kakkis
 
 Emil D. Kakkis, M.D., Ph.D.
 
 President and Chief Executive Officer
 
 (Principal Executive Officer)
 

Exhibit 31.2
CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002 
I, Howard Horn, certify that: 
1.
I have reviewed this Annual Report on Form 10-K of Ultragenyx Pharmaceutical Inc.; 
2.
Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the 
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this 
report; 
3.
Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the 
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 
4.
I am responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and 
internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: 
1.
Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to 
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those 
entities, particularly during the period in which this report is being prepared; 
2.
Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our 
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for 
external purposes in accordance with generally accepted accounting principles; 
3.
Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the 
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 
4.
Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent 
fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to 
materially affect, the registrant’s internal control over financial reporting; and 
5.
I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee 
of the registrant’s board of directors (or persons performing the equivalent functions): 
1.
All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably 
likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 
2.
Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal 
control over financial reporting. 
 
Dated: February 19, 2025
 /s/ Howard Horn
 
 Howard Horn
 
 
Executive Vice President, Chief Financial Officer, Corporate 
Strategy (Principal Financial Officer)
 
  
 

Exhibit 32.1
 
CERTIFICATION PURSUANT TO SECTION 906 OF 
THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. SECTION 1350) 
In connection with the accompanying Annual Report of Ultragenyx Pharmaceutical Inc. (the “Company”) on Form 10-K for the year ended December 
31, 2024 (the “Report”), I, Emil D. Kakkis, M.D., Ph.D., as President and Chief Executive Officer of the Company, and Howard Horn, as Executive Vice 
President, Chief Financial Officer, Corporate Strategy of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the 
Sarbanes-Oxley Act of 2002, that: 
(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 
(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 
 
Dated: February 19, 2025
 /s/ Emil D. Kakkis
 
 Emil D. Kakkis, M.D., Ph.D.
 
 
President and Chief Executive Officer
(Principal Executive Officer)
 
  
 
Dated: February 19, 2025
 /s/ Howard Horn
 
 Howard Horn
 
 
Executive Vice President, Chief Financial Officer, Corporate 
Strategy (Principal Financial Officer)